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5 from 8 votes

Keto Cheeseburger Casserole

This simple keto cheeseburger casserole is filling and hearty and makes a superb low-carb option to your cheeseburger.
Prep Time15 mins
Cook Time15 mins
Total Time30 mins
Course: Main Course
Cuisine: American
Keyword: Keto Cheeseburger Casserole
Servings: 6
Calories: 458kcal
Author: Angela


  • 2 lbs extra lean ground beef
  • 2 tsp coarse kosher salt not fine salt
  • ¼ cup avocado oil mayonnaise
  • ¼ tsp black pepper
  • 1 tbsp minced garlic
  • olive oil spray for the baking dish
  • ¼ cup unsweetened ketchup
  • 1 medium onion finely chopped (about 6 oz)
  • 1 ½ cup shredded sharp cheddar divided (about 6 oz)
  • 2 tbsp olive oil
  • 1 tbsp mustard


  • Preheat oven to 400°F. Then spray a 2-quart baking-dish with olive oil.
  • Heat the olive oil in a large-skillet over medium-high-heat for2 minutes. Then add onions and beef.
  • Cook, stirring to break up the beef, till the beef is browned and the onion is tender for 5 minutes. When there are fluids in the bottom of the skillet, then drain the mix and then return it to the skillet.
  • Stir in the black pepper, garlic and kosher salt. Cook, stirring for a few minute.
  • Turn off the heat. Stir in the unsweetened ketchup, mayonnaise, mustard and 1 cup 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, for 15 minutes.
  • Or, if your baking-dish is broiler-safe, broil the casserole 6-inches below the heating element (not straight under ) till cheese is melted, for 1-2 minutes.