Preheat oven to 350°F. Lightly grease a 3-quart baking dish with non-stick cooking spray. Set aside.
In a medium skillet, cook sausage until browned and crumbled. Drain, pour into a large bowl, and set aside.
In the same pan, cook the pepper and garlic for about 5 minutes, or until tender. Add vegetables to sausage mixture.
In another bowl, whisk together eggs, milk, garlic powder, cheese, salt, and pepper. Add in potatoes and stir thoroughly.
Pour egg and potato mixture in with sausage and mix well. Pour mixture into prepared baking dish and top with additional cheese, if desired.