Preheat the oven to 350 degrees F and spray a 9X13 baking pan or casserole dish with a non stick cooking spray.
In a large bowl combine all the ingredients except 1/2 cup of the cheese in a large bowl. Place this mixture in the baking dish.
Bake for 40-45 minutes until the top is browned slightly. Then top the casserole with the remaining shredded cheese. Bake for 3-5 more minutes until the cheese is melted.
Allow the casserole to cool at room temperature for 10-15 minutes. Then top with fresh parsley and enjoy!
Notes
It is very important to thaw the hash browns before making this casserole. Refrigerate the leftover casserole in an airtight container for up to 5 days. This casserole can be prepped the night before. Refrigerate and let the casserole come to room temperature before baking.