Preheat oven to 350 degrees.
In a skillet, cook and crumble your breakfast sausage or bacon of choice. Remove from skillet and drain most of the grease, leaving just enough to saute veggies in.
Add onion and bell pepper to skillet and cook until soft.
In a large bowl, combine all ingredients (eggs, hashbrowns, cheese, cooked protein and veggies). Stir to combine. Add salt and pepper.
Pour into a greased 9X13 baking dish and cover with foil. Bake for about 35-40 minutes, until set.
(Optional) If you choose, you can remove foil at this point and top with additional cheese. Return to oven for another 5 minutes or so to allow cheese to melt on top.