- 2 tablespoons butter, divided
- 1 cup sliced mushrooms
- 1 green bell pepper, chopped
- 1/2 cup chopped onion
- 2 teaspoons dried parsley
- 6 large eggs
- 1/4 cup milk
- 1 teaspoon salt
- 1 teaspoon ground black pepper
- 1 cup shredded Cheddar cheese, divided
- 1/2 (15 ounce) can black beans, rinsed and drained
- Preheat oven to 375 degrees F (190 degrees C). Grease an 8×8-inch casserole dish.
- Melt 1 tablespoon butter in a saucepan over medium heat; cook and stir mushrooms, green bell pepper, onion, and parsley until mushrooms are lightly browned, about 10 minutes.
- Place remaining 1 tablespoon butter in a microwave-safe bowl; heat in microwave until melted, about 10 seconds. Whisk melted butter, eggs, milk, salt, and pepper together in a bowl; stir in mushroom mixture, 1/2 of the Cheddar cheese, and black beans. Pour egg mixture into the prepared baking dish and top with remaining Cheddar cheese.
- Bake in the preheated oven until eggs are puffed and cheese is bubbling, about 45 minutes.