Grease a 9x13" in baking pan and preheat oven to 350°

Spread potatoes in an even layer in pan

Sprinkle grated cheese over potatoes

Brown sausage until cooked through and drain. Reserve 1-2 tablespoon of fat in pan

Saute peppers in reserved fat until they start to become soft, remove from heat and stir in onions

Sprinkle pepper mixture over cheese and potatoes, followed by the sausage

In a bowl, combine eggs, milk, salt, and pepper. Whisk until well combined and pour evenly over entire contents of pan.

Cover and refrigerate for up to 24 hours or bake immediately.

Bake for 35-45 minutes (time will vary based on ovens and altitude). The middle will be set and a knife will come out clean when inserted into the middle. The sausage will be nicely browned and the eggs puffed up a bit.