Combine the hash browns, cooked bacon, and sour cream in a bowl.
Spread the mixture into a freezer-safe, greased 9x13 baking dish.
Top the casserole with shredded cheese.
Thaw then remove the foil and plastic wrap.
Replace the foil on top of the dish and bake at 350° for 30 minutes.
Garnish with avocado, cilantro, diced tomato and sliced green onion.