Grease a large 6 quart slow cooker (or bigger) with cooking spray or butter.Layer half the hash browns in the bottom of the slow cooker.Top with half the sausage, bacon, cheese, onions, green pepper, and red pepper. Repeat layers with the remaining ingredients.Whisk together eggs, milk, salt, pepper, and sugar.Pour egg mixture over hash brown and cheese layers.Cook on low for 8 hours on low or 4 hours on high.