Preheat your oven to 350°F (175°C).
In a large bowl, combine the frozen hashbrowns, garlic powder, salt, and pepper.
Spread the hashbrown mixture evenly in a greased 9x13 inch baking dish.
In another bowl, whisk together the eggs and milk until well combined.
Stir in the diced ham or sausage and chopped bell peppers.
Pour the egg mixture evenly over the hashbrowns.
Sprinkle the shredded cheddar cheese on top.
Bake in the preheated oven for 45 minutes or until the casserole is set and golden on top.
Let it cool for 5-10 minutes before slicing.
Garnish with fresh parsley and serve warm.