This cheeseburger-inspired casserole combines seasoned ground beef and onion with mayonnaise, ketchup, mustard, and sharp cheddar. It makes six servings.
Ingredients
- Olive-oil cooking spray
- 2 tablespoons olive oil
- 2 pounds extra-lean ground beef
- 1 medium onion, finely chopped (about 6 ounces)
- 2 teaspoons coarse kosher salt
- ¼ teaspoon black pepper
- 1 tablespoon minced garlic
- ¼ cup avocado-oil mayonnaise
- ¼ cup unsweetened ketchup
- 1 tablespoon mustard
- 1½ cups shredded sharp cheddar (6 ounces), divided
Instructions
- Preheat the oven to 400°F. Coat a 2-quart baking dish with olive-oil cooking spray.
- Heat the olive oil in a large skillet over medium-high heat for about 2 minutes.
- Add the ground beef and onion. Cook for about 5 minutes, stirring to break up the beef, until the onion is soft and the beef reaches 160°F (71°C).
- If liquid remains at the bottom of the skillet, drain the mixture and return it to the skillet.
- Stir in the kosher salt, black pepper, and garlic. Cook, stirring, for 1 minute.
- Turn off the heat. Stir in the mayonnaise, ketchup, mustard, and 1 cup cheddar.
- Transfer the mixture to the prepared dish and sprinkle with the remaining ½ cup cheddar.
- Bake for about 15 minutes, until the cheese is melted and the center reaches 165°F (74°C).
Broiler option
If the baking dish is broiler-safe, broil the casserole about 6 inches below the heating element for 1–2 minutes instead of baking, until the cheese melts. Confirm that the center reaches 165°F (74°C).
Yield
Makes 6 servings.
Storage
Refrigerate cooled leftovers in a covered container and use within 4 days.
