Low-Carb Bacon, Egg, and Spinach Breakfast Casserole

Ingredients (10)

• 2 eggs
• 1 1/2 cups egg whites
• 2-3 cups frozen spinach
• 6 slices Butcher Box bacon
• 1 cup sliced mushrooms
• 1/2 cup red onion
• 1/2 green pepper
• 1/2 red pepper
• 1 1/4 cup shredded cheddar or a combo of cheddar and white cheddar
• salt and pepper to taste