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Keto Cheeseburger Casserole

This easy 30-minute keto cheeseburger casserole is hearty, filling, and an excellent alternative to a classic cheeseburger.

Prep Time
15 mins
Cook Time
15 mins
Total Time
30 mins
Servings: 6 servings
Calories: 458 kcal
Course: Main Course
Cuisine: American

Ingredients

  • Olive oil spray for the baking dish
  • 2 tablespoons olive oil
  • 2 pounds extra-lean ground beef
  • 1 medium onion finely chopped; 6 ounces
  • 2 teaspoons Diamond Crystal kosher salt see notes below
  • ¼ teaspoon black pepper
  • 1 tablespoon fresh garlic minced
  • ¼ cup mayonnaise
  • ¼ cup unsweetened ketchup
  • 1 tablespoon mustard
  • 1 ½ cup cheddar sharp, shredded, divided; 6 ounces total

Instructions

    Cup of Yum
  1. Preheat your oven to 400°F. Spray a 2-quart baking dish with olive oil. 
  2. 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, for about 5 minutes. 
  3. 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.
  4. Turn the heat off. Stir in the mayonnaise, unsweetened ketchup, mustard, and 1 cup of shredded cheddar. 
  5. Transfer the mixture to the prepared baking dish. Sprinkle with the remaining cheese. 
  6. Bake until the cheese is melted and the casserole is heated through, for about 15 minutes. Alternatively, 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. Serve immediately.

Notes

  • If you'd like to turn this casserole into a complete meal, add 1-2 cups of uncooked riced cauliflower to the ground beef/onion and cook everything together. You'll need to increase the olive oil by 1-2 tablespoons.
  • If using any salt other than Diamond Crystal Kosher Salt, including Morton kosher salt, use half the amount listed.
  • You can make this recipe with ground chicken or turkey thighs. It won't be the same, but it's still good. I recommend using ground chicken thighs, not chicken breast, which is too lean.
  • You can keep the leftovers in an airtight container in the fridge for 3-4 days. Reheat them gently in the microwave at 50% power. You can also freeze individual servings for up to three months.

Nutrition Information

Calories 458kcal (23%) Carbohydrates 4g (1%) Protein 38g (76%) Fat 31g (48%) Saturated Fat 7g (35%) Sodium 771mg (32%) Sugar 2g (4%)

Nutrition Facts

Serving: 6servings

Amount Per Serving

Calories 458

% Daily Value*

Calories 458kcal 23%
Carbohydrates 4g 1%
Protein 38g 76%
Fat 31g 48%
Saturated Fat 7g 35%
Sodium 771mg 32%
Sugar 2g 4%

* Percent Daily Values are based on a 2,000 calorie diet.