Caramelized Onion & Mushroom Quiche
Onions and mushrooms are classic quiche ingredients. Set out pie crust to thaw for 10 to 20 minutes. Meanwhile, heat oil in a large nonstick skillet over medium heat. Photo by: Carolyn A. Hodges, R.D. Add onion and cook, stirring occasionally until beginning to soften, about 5 minutes. Season with 1/4 teaspoon salt and set aside to cool slightly. Transfer the vegetable mixture to the crust. Whisk eggs, milk, pepper and the remaining 1/4 teaspoon salt in a medium bowl....