Preheat oven to 350 degrees F and grease a 9x13 inch baking dish with cooking spray. Set aside.
Place sausage, bell pepper, onion, and 1/2 teaspoon salt into a large non-stick sauté pan and cook, breaking up the sausage as you go, until the meat is no longer pink and the vegetables are tender.
Drain any excess grease, then set aside.
Place eggs, milk, garlic powder, paprika, black pepper, and 1 teaspoon salt into a large bowl, then whisk until combined.
Stir in the cooked sausage/veggie mixture, frozen hashbrowns, Monterey-jack cheese, cheddar cheese, and parmesan cheese, then pour into the prepared baking dish.
Bake in preheated oven for about 1 hour - 1 hour and 15 minutes (cover with tin foil if the top starts to get too brown), or until the eggs have set.
Remove from oven and let rest for about 5-10 minutes, then slice, serve, and enjoy!
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