Description
This Keto Cheeseburger Casserole is a delicious low-carb, high-protein dish perfect for those following a ketogenic lifestyle. Featuring lean ground beef, sharp cheddar cheese, and a tangy blend of mayonnaise, ketchup, and mustard, this casserole combines all the classic cheeseburger flavors in a warm, cheesy bake that’s ready in just 30 minutes.
Ingredients
Scale
For the Casserole
- Olive oil spray, for greasing the baking dish
- 2 tablespoons olive oil
- 2 pounds extra-lean ground beef
- 1 medium onion, finely chopped (about 6 ounces)
- 2 teaspoons Diamond Crystal kosher salt (or equivalent kosher salt)
- 1/4 teaspoon black pepper
- 1 tablespoon fresh garlic, minced
- 1/4 cup mayonnaise
- 1/4 cup unsweetened ketchup
- 1 tablespoon mustard
- 1 1/2 cups sharp cheddar cheese, shredded (about 6 ounces total), divided
Instructions
- Preheat Oven and Prepare Baking Dish: Preheat your oven to 400°F (200°C). Lightly spray a 2-quart baking dish with olive oil to prevent the casserole from sticking.
- Brown Beef and Onions: Heat 2 tablespoons of olive oil in a large skillet over medium-high heat for about 2 minutes. Add the extra-lean ground beef and finely chopped onion. Cook, breaking up the meat with a spoon, until the beef is browned and the onions are softened, approximately 5 minutes.
- Drain and Season: Carefully drain any excess liquid or fat from the skillet. Return the meat and onions to the skillet. Stir in 2 teaspoons kosher salt, 1/4 teaspoon black pepper, and 1 tablespoon minced garlic. Cook, stirring constantly, for an additional 1 minute to incorporate the seasonings.
- Add Sauce and Cheese: Remove the skillet from heat. Stir in 1/4 cup mayonnaise, 1/4 cup unsweetened ketchup, 1 tablespoon mustard, and 1 cup of shredded sharp cheddar cheese. Mix until well combined and creamy.
- Assemble Casserole: Transfer the beef mixture into the prepared 2-quart baking dish. Evenly sprinkle the remaining 1/2 cup shredded cheddar cheese over the top.
- Bake or Broil: Place the casserole in the preheated oven and bake until the cheese is melted and the dish is heated through, about 15 minutes. Alternatively, for a golden bubbly top, broil 6 inches below the broiler element for 1–2 minutes if your baking dish is broiler-safe. Serve hot and enjoy.
Notes
- Diamond Crystal kosher salt is lighter and less dense than other kosher salts; adjust salt quantity if using a different brand.
- Unsweetened ketchup keeps the recipe keto-friendly by avoiding added sugars.
- Use extra-lean ground beef to reduce fat and make the casserole healthier.
- Broiling the casserole for a couple of minutes adds a crispy, golden topping but watch carefully to prevent burning.
- For a dairy-free version, use dairy-free cheese alternatives and substitute mayonnaise accordingly.
