Creating a Healthy Breakfast Casserole is straightforward if you follow these steps:

1. Preheat Oven: Preheat your oven to 350°F (175°C).
2. Prepare Baking Dish: Grease a 9×13-inch baking dish with cooking spray or olive oil.
3. Cook Protein: In a skillet, cook the turkey sausage over medium heat until browned. Drain excess fat and set aside.
4. Mix Eggs and Milk: In a large bowl, whisk together the eggs and milk until well combined.
5. Add Seasonings: Stir in garlic powder, onion powder, salt, and pepper to the egg mixture.
6. Combine Ingredients: Add the cooked sausage, diced vegetables, shredded potatoes, and half of the cheese to the egg mixture. Stir until everything is evenly coated.
7. Pour into Dish: Pour the mixture into the prepared baking dish, spreading it evenly.
8. Top with Cheese: Sprinkle the remaining cheese on top of the casserole.
9. Bake: Place the dish in the preheated oven and bake for 35-40 minutes, or until the eggs are set and the top is golden brown.
10. Cool: Remove from the oven and let it cool for about 10 minutes before slicing.

These steps will lead you to a mouthwatering Healthy Breakfast Casserole that is sure to impress!