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This easy 30-minute keto cheeseburger casserole is hearty and filling and makes a wonderful low-carb alternative to a classic cheeseburger. You won’t miss the bun!

You can make this recipe as written and serve it with a side of veggies. Or you could add veggies such as cauliflower rice or spinach to turn it into a complete meal.

Keto cheeseburger casserole served in a white baking dish.

I really like casseroles. They’re just so EASY. You place a few ingredients in a baking dish, put it in the oven, and 30-60 minutes later, dinner is ready!

This casserole is so delicious, in a delightfully non-gourmet sort of way. Grownups and kids alike always enjoy it. You can make it as written, you can vary the spices you use, and you can add veggies.


Like most casseroles, it’s a very forgiving and flexible recipe. See specific suggestions below.

Keto Cheeseburger Casserole

This easy keto cheeseburger casserole is filling and flavorful. It makes a wonderful low-carb alternative to a cheeseburger. 


  • ▢Olive oil spray for the baking dish
  • ▢2 tablespoons olive oil
  • ▢2 lb. extra lean ground beef
  • ▢1 medium onion finely chopped (6 oz)
  • ▢2 teaspoons Diamond Crystal kosher salt or 1 teaspoon fine salt
  • ▢¼ teaspoon black pepper
  • ▢1 tablespoon minced fresh garlic
  • ▢¼ cup avocado oil mayonnaise
  • ▢¼ cup unsweetened ketchup
  • ▢1 tablespoon mustard
  • ▢1 ½ cup shredded sharp cheddar divided (6 oz)


  • Preheat your oven to 400 degrees F. Spray a 2-quart baking dish with olive oil. 
  • Heat the olive oil in a large skillet over medium-high heat, for about 2 minutes. Add the beef and the onions. Cook, stirring to break up the beef until the meat is browned and the onion is soft, about 5 minutes. 
  • If there are liquids at the bottom of the skillet, carefully drain the mixture and return it to the skillet. 
  • Stir in the kosher salt, black pepper, and garlic. Cook, stirring, for 1 more minute.
  • Turn the heat off. Stir in the mayonnaise, unsweetened ketchup, mustard, and 1 cup of shredded cheddar. 
  • Transfer the mixture to the prepared baking dish. Sprinkle with the remaining cheese. 
  • Bake until the cheese is melted and the casserole is heated through, about 15 minutes. Or, if your baking dish is broiler-safe, broil the casserole 6 inches below the heating element (not directly below) until the cheese is melted, 1-2 minutes. 



If you’d like to turn this casserole into a complete meal, you can add 1-2 cups of uncooked riced cauliflower to the meat and onion and cook everything together. You might need to increase the olive oil a little if you do.


By uvu44

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