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In a medium bowl, combine:
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1 cup sour cream
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½ cup mayonnaise
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2 tablespoons ketchup
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1 tablespoon mustard
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1 teaspoon garlic powder
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1 teaspoon onion powder
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Salt and pepper to taste
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Mix until smooth. This will act as the “secret sauce” layer between the beef and cheese.
Step 3: Assemble the Casserole
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Lightly grease or spray a 9×13-inch baking dish.
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Evenly spread the cooked beef mixture across the bottom.