Healthy Breakfast Casserole

Name: Healthy Breakfast Casserole
Prep time: 10 min
Cook time: 45 min
Total time: 55 min
Cuisine: American
Ingredients: 6 Large Whole Eggs; 1 Cup Cheese (I like Cheddar); 200 g Greek Yogurt (Plain); 1 Pound Protein (Cooked (Ham, Ground Beef or Turkey, Sausage, Vegetarian Alternative, Etc)); 50 g Spinach (*Optional); ½ White Onion (*Optional); 3 Bell Pepper (Various Colors *Optional); Salt (Your Choice); Black Pepper (Your Choice)