Preheat and Prep:

1. Preheat your oven to 375°F (190°C).
2. Spray a 9×13 inch baking dish with non-stick cooking spray.

Cook the Sausage:

1. In a skillet over medium heat, brown the pork sausage, breaking it into small pieces as it cooks.
2. Once browned, drain any excess grease and set the cooked sausage aside.

Whisk the Eggs:

1. In a large mixing bowl, whisk together the eggs, whole milk or heavy cream, salt, black pepper, and garlic powder until well combined.

Layer the Ingredients:

1. In the prepared baking dish, layer the thawed hash browns evenly on the bottom.
2. Add the cooked sausage in an even layer over the hash browns.
3. Sprinkle the cheddar cheese evenly over the sausage.

Pour the Egg Mixture:

1. Carefully pour the whisked egg mixture over the layered ingredients in the baking dish, ensuring that the mixture is evenly distributed.

Cover and Bake:

1. Cover the baking dish with foil and bake in the preheated oven for 40 minutes.
2. After 40 minutes, remove the foil and continue baking for an additional 20 minutes, or until the casserole is golden brown and set in the center.

Serve and Enjoy:

1. Once fully baked, remove the casserole from the oven and allow it to cool slightly before serving.
2. Serve slices of the Sausage Hashbrown Breakfast Casserole with your favorite toppings, such as hot sauce, salsa, sour cream, or avocado.