Preheat oven to 375°F (190°C)

Grease a baking dish with butter or cooking spray

Heat a skillet over medium heat and cook the sausage until browned

Break sausage into small crumbles while cooking

Remove sausage from heat and drain excess grease if needed

In a large bowl whisk together eggs and heavy cream

Add salt, black pepper, garlic powder, and onion powder to the egg mixture

Stir in shredded cheddar cheese and mozzarella cheese

Add cooked sausage, diced bell peppers, and green onions

Mix everything until evenly combined

Pour the mixture into the prepared baking dish

Bake until eggs are fully set and the top turns golden

Let the casserole cool slightly before slicing

Garnish with chopped parsley before serving