Preheat the oven to 350˚F. Lightly spray a 9x13 inch baking dish with cooking spray and set aside.
In a large bowl, mix together the cheese, salsa, onion, sour cream, soup, pepper and olives until fully combined. Fold in the hash browns.
Pour into the prepared baking dish and bake in the preheated oven for 50 minutes. Sprinkle the top with cherry tomatoes and parsley, and cook for an additional 10 minutes.