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