Bake for 50 minutes. Over medium heat, cook the onion until soft. Preheat oven to 375 degrees. Grease one 8x12 inch baking dish. Meanwhile, in a large mixing bowl, mix together the soup, mayo, tuna, cheddar, minced onion, corn, peas, and seasonings until well combined. Cook until golden brown. In a large bowl, combine the onion, potatoes, sour cream, soup, cheese, pepper and hot sauce. The first Hash Brown Casserole recipes were made by combining frozen hash browns, condensed cream of chicken soup, mayonnaise, Parmesan cheese, and cheddar cheese together, spreading in a baking dish, topping with more cheese followed by corn flakes, crushed potato chips or crushed Ritz crackers. * 3 can Tuna, Canned in Water * 3 cups Frozen Shredded Style Hash Brown Potatoes * 1 can Campbell's Cream of Mushroom Soup *2 oz. In a saute pan, heat butter or margarine and crackers. Grease a 9x13 inch baking dish and set aside. Mix well and pour into baking dish. Mixed Vegetables, frozen Cook the egg noodles according to package directions, drain and return to the pot.