Keto Cheeseburger Casserole

By Yoly

5.0 / 5

15min

20min

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