This scrumptious Cheesy Keto Burger Bake offers a satisfying low-carb alternative to traditional cheeseburgers. Enjoy a blend of juicy ground beef, onions, and a medley of sauces, all topped with delicious melted cheddar.
Preheat your oven to 400 degrees F. Spray a 2-quart baking dish with olive oil.
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Heat the olive oil in a large skillet over medium-high heat for about 2 minutes.
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Add the ground beef and diced onions to the skillet.
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Cook, stirring to break up the beef, until the meat is browned and the onion is soft, about 5 minutes.
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If there are liquids at the bottom of the skillet, carefully drain the mixture and return it to the skillet.
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Stir in the kosher salt, black pepper, and garlic powder. Cook, stirring, for 1 more minute.
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Turn the heat off.
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Stir in the avocado oil mayonnaise, unsweetened ketchup, mustard, and 1 cup of shredded cheddar.
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Transfer the mixture to the prepared baking dish.
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Top with the remaining 1/2 cup of shredded cheddar.
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Bake until the cheese is melted and the casserole is heated through, about 15 minutes.
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Optional: If your baking dish is broiler-safe, broil the casserole 6 inches below the heating element for 1-2 minutes until the cheese is slightly browned.