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Home » Meal » Condiments

Published: Dec 7, 2022 by Genevieve · This post may contain affiliate links.

Caramelized Onions and Mushrooms

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Caramelized onions and mushrooms are shown in a pan with the URL www.twocloveskitchen.com.
Caramelized onions and mushrooms are shown in a pan with the URL www.twocloveskitchen.com.
Caramelized onions and mushrooms are shown in a pan with the URL www.twocloveskitchen.com.
Caramelized onions and mushrooms are shown in a pan with the URL www.twocloveskitchen.com.
Caramelized onions and mushrooms are shown in a pan with the URL www.twocloveskitchen.com.
Caramelized onions and mushrooms are shown in a pan with the URL www.twocloveskitchen.com.
Caramelized onions and mushrooms are shown in a pan with the URL www.twocloveskitchen.com.
Caramelized onions and mushrooms are shown in a pan with the URL www.twocloveskitchen.com.

This Caramelized Onions and Mushrooms recipe is an easy way to add deeply savory, sweet, rich flavor to everything from burgers to soups to breakfast dishes. The key is patience and a bit of olive oil for a delicious, soft, craveable result.

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A wooden spoon offers a closeup view of caramelized mushrooms and onions above a pan in the background.

Why You'll Love This Dish

It's so delicious. Plain and simple, this is one of those condiments that is completely worth the time it takes to make. It's incredibly savory, sweet, and adds a wonderful depth of flavor to any dish.

It's versatile. Try these caramelized onions and mushrooms in everything from burgers to breakfast! You can add them to soups, stews, sauces, stir-fry dishes, salads, omelets, quiche, or sandwiches. I've even put them in quesadillas!

While the onions may take time to brown, this dish is really easy! It's a simple recipe. All you have to have is a bit of patience and stir every 5 to 10 minutes for a perfect result every time.

You can make it in advance. Spend some time making these caramelized onions and mushrooms and you'll have this delicious condiment to add to everything you eat for a week.

Jump to:
  • Why You'll Love This Dish
  • What You'll Need
  • How to Make Caramelized Onions and Mushrooms
  • FAQ
  • Variations
  • How to Store
  • How to Serve
  • Expert Tips
  • More Recipes You'll Love
  • 📖 Recipe
  • 💬 Comments
The ingredients for caramelized onions and mushrooms sit on a white marble cutting board.

What You'll Need

  • Onions I used yellow onions here, but you can use red onions or sweet onions too.
  • Mushrooms Cremini mushrooms are my choice, but baby bella or button mushrooms (white mushrooms) will work just fine.
  • Garlic Fresh garlic is always my choice when available, but you can try using chopped, jarred garlic as well.
  • Extra Virgin Olive Oil A good quality oil would be nice here because you can taste it so clearly, but use whatever you have on hand.
  • Thyme Feel free to use dried or fresh thyme here. You can omit this if you don't have it on hand or don't like it.
  • Salt Diamond Crystal Kosher Salt is my brand of choice. It coats food evenly and is less salty than traditional table salt by volume, making it much easier to taste as you go! You can use salt and pepper if you'd like.

How to Make Caramelized Onions and Mushrooms

Step One Set a cast iron or stainless steel pan on high heat. Clean the mushrooms by wiping them with a clean cloth or paper towel. Cut off the bottom eighth inch of the mushroom.

Slice and add the mushrooms to the pan, cooking until golden brown on both sides.

Dirt is wiped off of a mushroom cap with a paper towel.
A mushroom is shown with about one eighth inch cut off of the stem.
Sliced mushrooms are shown on a white cutting board.
Sliced mushrooms and salt are added to the pan.
The mushrooms are shown fully browned.

Step Two Slice or finely chop the garlic.

Minced garlic sits on a white cutting board.

Step Three Thinly slice your onion.

An onion is shown with the top and bottom portions cut off.
An onion is cut in half.
A halved onion is sliced at a diagonal angle to create even, thin slices.
Sliced onions sit in a metal bowl.

Step Four Add the garlic, onions, thyme, and salt along with a bit more olive oil to the pan. Mix the cooked mushrooms in with the remaining ingredients. Turn heat to medium-low.

Onions, garlic, salt, and thyme are added to the pan with the mushrooms.
The onions and mushrooms are mixed together.

Step Five Stir every 5 or so minutes, ensuring the onions don't burn. If everything appears dry, add a bit more oil. This process will take about 45 minutes to an hour. See below for the stages of cooking. You're looking for a deeply browned end result without any burning.

Be patient - the caramelization process can take a while when done properly!

The onions and mushrooms are starting to soften after 5 minutes of cooking.
5 minutes
The mushrooms and onion have softened a bit more after 10 minutes of cooking.
10 minutes
The mushrooms and onions are shown after 20 minutes with the onions much softer and a light golden color.
20 minutes
The mushrooms and onions are shown after 30 minutes and they are a light golden color and soft.
30 minutes
The caramelized onions and mushrooms are quite soft and are a light golden brown color.
40 minutes
The finished caramelized onions and mushrooms are now deeply browned and softened.
50 minutes

Step Six When the onions are browned and fully softened, almost disintegrating into one another, remove them from the heat. Serve right away or store in the refrigerator for future use.

A wooden spoon offers a closeup view of caramelized mushrooms and onions above a pan in the background.

FAQ

Should I cook onions or mushrooms first?

Mushrooms won't brown at low heat, and sauteed onions will burn at high heat, so cook your mushrooms first. This will allow them time on high heat to develop a browned exterior before adding the onions at a lower heat.

What oil is best for caramelizing onions?

Olive oil is best here because the overall taste is preferable. If you are out of olive oil, try a neutral oil like grapeseed or avocado oil. Some recipes recommend vegetable oil, but I personally do not like the taste it imparts.

Should you caramelize onions in butter or olive oil?

In this particular recipe, I call for olive oil because of the higher temperature used for the mushrooms. This could negatively affect the taste of the butter. If you are not using mushrooms, feel free to try this recipe with butter.

Can you sauté onions and mushrooms together?

Absolutely! As this recipe proves, the two are a great pair when sauteed together. I do recommend starting the mushrooms first, however, as mushrooms do well with an initial sear on high heat.

Should you stir onions when caramelizing?

Yes, but not frequently. Stirring every 5 to 10 minutes is plenty to ensure nothing is sticking or burning.

Variations

No Mushrooms Feel free to make this recipe with just onions. It will take less time and still be quite delicious.

Different Herbs You can omit the thyme, or garnish at the end of cooking with a fresh, soft herb like parsley.

Sautéed If you are running short on time, you can stop cooking once the onions are just softened for a less sweet and concentrated sautéed onion. You can also make sautéed mushrooms on their own, which I do often.

How to Store

Fridge Leftover cooked onions and mushrooms can be stored in an airtight container for 5 to 7 days in the fridge. To reheat, add directly to the dish you are making (if it's a soup, stew, or sauce), or reheat in a pan over medium-low heat.

You can also reheat them in the microwave for a few minutes.

Freezer You can freeze caramelized onions for up to 3 months. I recommend placing them in a gallon storage bag and squeezing out all of the air before freezing.

When you want to add some onions to your meal, break off a piece and add it directly to the pot. You can also defrost in the refrigerator overnight and then reheat on the stove or in the microwave as above.

The texture of the mushrooms may suffer when freezing, so I recommend making a batch of just onions if you are freezing. However, if the texture doesn't bother you, go for it!

How to Serve

Below are some ideas for ways to incorporate this wonderful condiment into dishes:

Soup Try stirring some of these caramelized onions and mushrooms into a soup of your choice for a burst of flavor. It would be wonderful mixed into this Greek Chickpea Soup or this Instant Pot Navy Bean Soup.

Roasted Vegetables This is spectacular mixed into roasted vegetables. Try with this Roasted Tenderstem Broccoli or these Roasted Cherry Tomatoes on the Vine.

Roasted Meats Serve this as a condiment for any roast meat of your choosing, such as this roast chicken.

Grain Bowls In place of cucumbers, try some caramelized onions and mushrooms in this Mediterranean Grain Bowls recipe or this Warm Grain Bowl with Goat Cheese and Greens.

Quesadilla Try adding a spoonful to your favorite quesadilla, like this Carne Asada Quesadilla with Ranchera Meat.

Steak, Burgers, Pork Caramelized mushrooms and onions are a perfect topping or side dish for steaks and burgers. Try it on this amazing BBQ Pork Steak from our friends at Girl Carnivore!

Eggs Add a dollop to your favorite egg dish, like this Leek & Squash Quiche.

Potatoes Mix some into your favorite potato dish, like these Calabrian Potatoes or these Air Fryer Fingerling Potatoes.

Bread or Toast Spread onto your favorite toast, bread, or crackers.

Cheese or Charcuterie Board This would be wonderful on a board with cheese, crackers, and meats. Serve with some roasted cherry tomatoes on the vine!

Expert Tips

  • Be super patient. Properly caramelized onions take a long time, but they are so worth it! Keep your heat on medium-low at the highest, and find something else to occupy yourself. I set a recurring 5- or 10-minute timer so I'm reminded to stir.
  • Never use non-stick pans on high heat. If you only have non-stick pans, stick with medium heat for your mushrooms. Cooking on a lower heat preserves the non-stick coating your pans, making them last longer!
  • Be sure your pan is hot enough. If you are using stainless steel, check out this cool test (well, cool if you're a food nerd like me) to be sure your pan is hot enough before adding the oil and mushrooms.
  • Remove the green stem from the garlic. Do you ever have garlic that tastes a little bitter? Try removing the inner green stem if it is noticeable to decrease this bitterness. See below for the stem I'm referring to.
A clove of garlic with a small green stem at its top is shown in the palm of the author's hand.
A garlic clove is slice in half lengthwise and the green stem in the center is removed.

More Recipes You'll Love

Looking for more flavor-boosting recipes? Try the suggestions below!

Roasted Garlic

Spicy Pickled Onions

Tomato and Mascarpone Sauce

Pineapple Habanero Sauce

📖 Recipe

A wooden spoon offers a closeup view of caramelized mushrooms and onions above a pan in the background.

Caramelized Onions and Mushrooms

Caramelized Onions and Mushrooms are an easy way to add deeply savory, sweet, rich flavor to everything from burgers to soups to breakfast dishes!
5 from 44 votes
Print Pin Rate
Course: Condiment, Snack
Cuisine: American
Keyword: Caramelized Mushrooms, Caramelized Onions, Easy Recipe, Easy Side
Prep Time: 5 minutes
Cook Time: 1 hour 5 minutes
Total Time: 1 hour 10 minutes
Servings: 8 ¼ cup servings
Calories: 119kcal
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Equipment

  • 1 Large Frying Pan cast iron or stainless steel is preferable

Ingredients

  • ¼ cup olive oil extra virgin, divided
  • 2 pounds onions yellow, red, or sweet
  • 1 pound mushrooms cremini or button
  • 2 to 4 cloves garlic optional
  • ½ tablespoon thyme leaves fresh or dried, optional
  • kosher salt to taste

Instructions

  • Clean and slice the mushrooms. Slice or finely chop the garlic. Thinly slice the onions.
  • Set a cast iron or stainless steel pan on high heat. Once hot, add half of the olive oil and mushrooms with a pinch of salt.
  • Cook for about 15 to 20 minutes, stirring occasionally until the mushrooms have received a hard sear and are browned on both sides. Bring heat down to medium-low.
  • Add the onions, garlic, thyme, salt, and remaining olive oil. Stir everything together.
  • Stir again every 5 to 10 minutes for approximately 50 minutes, or until the onions are deeply browned, soft, and sweet. Add a bit more oil as needed if the pan looks dry.
  • Taste for seasoning and serve.

Notes

General
  • Serving sizes and calories are approximate.
  • Don't heat the onions above medium-low or you may risk burning them.
  • If you only have a non-stick pan, use medium heat for the mushrooms. Using a low heat with non-stick cookware will preserve its coating and make the pan last longer.
Storage
  • Cooked onions and mushrooms can be stored for 5 to 7 days in the fridge or for 3 months in the freezer.
  • I recommend placing them in a gallon storage bag and squeezing out all of the air before freezing.
  • The texture of the mushrooms may be altered when frozen and reheated.
Reheating
  • To reheat from the fridge, add directly to the dish you are making (if it's a soup, stew, or sauce), or reheat in a pan over medium-low heat. You can also reheat them in the microwave for a few minutes.
  • From frozen, break off a piece and add it directly to the pot. You can also defrost in the refrigerator overnight and then reheat on the stove or in the microwave as above.
Use
  • Try on sandwiches, burgers, egg dishes, and potatoes, in soups, stews, and sauces, as a topping for roasted vegetables or meats, in quesadillas, or on grain bowls.

Nutrition

Calories: 119kcal | Carbohydrates: 13g | Protein: 3g | Fat: 7g | Saturated Fat: 1g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 5g | Sodium: 8mg | Potassium: 352mg | Fiber: 3g | Sugar: 6g | Vitamin A: 23IU | Vitamin C: 11mg | Calcium: 31mg | Iron: 1mg

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Reader Interactions

Comments

  1. Molly P says

    December 07, 2022 at 2:59 pm

    5 stars
    Made this to use as a quiche filling, and it was completely delicious. Nothing better than caramelized onions, and the mushrooms take it over the top!

    Reply
    • Genevieve says

      December 07, 2022 at 3:13 pm

      That's a fantastic idea! Sounds amazing. Thanks Molly!

      Reply
  2. Sharina says

    December 08, 2022 at 5:04 am

    5 stars
    Made these caramelized onions and mushrooms for our family's favorite burger and it was a hit! We love its rich flavor and sweetness. I'll surely have this recipe on repeat!

    Reply
    • Genevieve says

      December 12, 2022 at 2:16 pm

      I'm so happy to hear the family enjoyed these!

      Reply
  3. Journa Liz Ramirez says

    December 08, 2022 at 6:19 am

    5 stars
    These caramelized Onions and Mushrooms are so good! My family enjoyed it so much and love it on repeat. Thanks, Gen, for this recipe.

    Reply
    • Genevieve says

      December 12, 2022 at 2:15 pm

      yay! Thanks Journa

      Reply
  4. Wendy says

    December 08, 2022 at 6:31 am

    5 stars
    This was such a fabulous topping to grilled chicken sandwiches! I can't wait to make this again.

    Reply
    • Genevieve says

      December 12, 2022 at 2:15 pm

      Fantastic idea! So glad you enjoyed, Wendy.

      Reply
  5. Relle says

    December 08, 2022 at 7:15 am

    5 stars
    You had me at caramelized. Can't wait to try this. Thank you.

    Reply
    • Genevieve says

      December 12, 2022 at 2:15 pm

      Thanks Relle! Hope you enjoy

      Reply
  6. Shelby says

    December 08, 2022 at 8:06 am

    5 stars
    So flavorful! We had ours on top of steak but I used the leftovers in a pasta the next day and it was perfect!

    Reply
    • Genevieve says

      December 12, 2022 at 2:15 pm

      Putting these in pasta sounds amazing! Thanks Shelby

      Reply
  7. Jere Cassidy says

    December 08, 2022 at 8:24 am

    5 stars
    Made your caramelized onions and mushrooms to go over steak and honestly I could have just served this recipe by itself, my hubby loved it. Really easy to make, just gotta be patient.

    Reply
    • Genevieve says

      December 12, 2022 at 2:14 pm

      Yep, people eat them straight out of the pan at my house, haha. Thanks Jere! So glad you enjoyed them.

      Reply
  8. Sonia says

    December 08, 2022 at 4:15 pm

    The mushrooms take the caramelized onions over the top! I made this to serve with steaks. It was amazing! So flavorful! Everybody loved it. Next, I will serve it as a condiment with a cheese board.

    Reply
    • Genevieve says

      December 12, 2022 at 2:14 pm

      Ooh, so good with steaks! Thanks Sonia.

      Reply
  9. Cami says

    December 29, 2022 at 6:36 am

    5 stars
    Love this recipe so easy to make!

    Reply
    • Genevieve says

      December 29, 2022 at 8:46 am

      Thanks Cami!

      Reply

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Hi, I'm Gen! Welcome to Two Cloves Kitchen. I am a certified professional cook, lifelong recipe creator, writer, editor, and food lover. I use my culinary knowledge to teach you how to utilize your ingredients and equipment to their fullest potential, turning ordinary meals into something exciting with bold, fresh, innovative ideas and flavors.

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