1. Combine hash browns, cheese, sour cream, salt, onion, soup and 1/2 cup butter in a large bowl. Mix well. 2. Put mixture into a 9×13 casserole dish. 3. Combine cornflakes and 1/2 cup butter and sprinkle over top of casserole. 4. Bake at 350 degrees for 30-45 minutes. Enjoy!