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1/2 cup melted butter or margarine
1 1/2 cups cheddar cheese
1 cup Velveeta cheese, cubed
1/2 cup chopped red onion
2 cans cream of whatever soup
1 cup sour cream
1 tsp. dry mustard
Salt and pepper to taste
2 - 3 cups corn flakes

Mix all ingredients together except potatoes and corn flakes in saucepan. Heat mixture on low until all cheese is melted. Stir in hash browns and put into 9 x 13 baking dish, which has been sprayed with Pam. Top with corn flakes. Bake at 325 degrees for one hour. Serves 16.