Caramelized Onion Mushroom Quiche
Ingredients
- 1 (9 inch) frozen prepared pie crust
- 1 tablespoon extra-virgin olive oil
- ½ large red onion, sliced
- 8 ounces cremini mushrooms, sliced
- ½ teaspoon salt, divided
- 4 large eggs
- 1 ¼ cups whole milk
- ⅛ teaspoon ground pepper
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