Preheat the oven to 375 degrees Fahrenheit.
Place a pan on the stove over medium-low heat. Add 1 tablespoon olive oil or butter, then add the garlic and cook until fragrant, 30 seconds to 1 minute.
Add the spinach and cook until wilted. Season with a bit of salt and set aside.
Chop your salmon into bite-sized pieces and set aside.
Prepare your pie dish by brushing with olive oil, spraying with pan spray, or greasing with a bit of butter.
Place your pie crust in the pie plate. Prick the pie crust all over with a fork, then bake the crust for 10 minutes and set aside to cool.
In a large mixing bowl, whisk the eggs. Then add the milk, spinach mixture, salmon, goat cheese, dill, salt, and pepper, if using.
Carefully pour the salmon quiche mixture into the pastry crust. Place the quiche in the oven and cook for 35 to 45 minutes. Remove from the oven and let cool.
The quiche is done when the center of the egg mixture is just set and no longer runny. The edges should be completely set and it should jiggle a bit in the center when you shake the pie dish.
Serve topped with a bit of crème fraîche and fresh dill.