Cut the head of garlic crosswise, exposing the flesh of the cloves, about ¼ to ½ of an inch.
Place on a piece of tin foil. Drizzle or brush with the olive oil, ensuring the olive oil gets between the cloves and coats the top thoroughly.
Seal the tin foil in a ball and place it in the oven. Cook at 350 degrees Fahrenheit for 30 to 40 minutes.
Check for doneness before 30 minutes have elapsed by carefully removing from the oven, peeling back the foil, and examining the color and texture.
Poke a paring knife into one of the cloves. If there is no resistance, the color is golden brown, and the garlic is fragrant, it is ready to serve! If not, seal the foil ball again, return to the oven, and continue cooking.
Once ready, season with a pinch of kosher salt for a more concentrated flavor.