This flavorful broccoli quiche is made with frozen chopped broccoli, cheddar cheese, and mushrooms. Like most quiches, this one is versatile. Use swiss cheese or a cheddar jack blend, or add some diced ham, cooked crumbled bacon, turkey, or chicken for a heartier dish. See the tips and variations for more add-in suggestions and substitution ideas. Use a deep dish frozen pie pastry, a ready-made refrigerated pastry, or homemade pastry. See this food processor pastry or the all-butter pastry make a double batch of pastry and freeze a disk for another day. Serve this quiche for lunch, brunch or dinner, with soup or a salad.