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