Keto Cheeseburger Casserole

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 coarse kosher salt (not fine salt)
• 1/4 teaspoon black pepper
• 1 tablespoon minced garlic
• 1/4 cup avocado oil mayonnaise
• 1/4 cup unsweetened ketchup
• 1 tablepsoon mustard
• 1 1/2 cup shredded sharp cheddar, divided (6 oz)

INSTRUCTIONS:

1. Preheat oven to 400 degrees F. Spray a 2-quart baking dish with olive oil. 
2. Heat the olive oil in a large skillet over medium-high heat, 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, about 5 minutes. 
3. If there are liquids at the bottom of the skillet, drain the mixture and return it to the skillet. 
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