Keto Cheeseburger Casserole
Ingredients:
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1 teaspoon butter, or as needed
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1 pound ground beef
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½ cup diced onion
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2 cloves garlic cloves, pressed
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salt and freshly ground black pepper to taste
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1 cup shredded sharp Cheddar cheese, divided
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2 tablespoons ketchup
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2 tablespoons mayonnaise
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2 tablespoons diced dill pickles
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½ tablespoon mustard