Preheat oven to 400 degrees.
Grease a 9 x 13 glass baking dish with butter. Set aside.
Brown sausage in a skillet.
Pour sausage into baking dish, including any drippings.
Whisk together eggs, milk, garlic powder, pepper, and salt (I use 1 tsp. salt.)
Pour egg mixture over sausage.
Sprinkle cheese over egg mixture.
Bake 12-15 minutes. (Knife inserted should come out clean.)