This hearty casserole layers seasoned ground beef with cheese and frozen French fries for a simple, satisfying dinner that tastes like a loaded cheeseburger. It's an easy weeknight favorite the whole family will enjoy.
In a large skillet over medium heat, cook ground beef and diced onion until beef is browned and onions are soft, about 7–8 minutes. Drain excess grease.
Stir in garlic, salt, pepper, mustard, ketchup, and Worcestershire sauce.
Simmer for 2–3 minutes.
Spread cooked beef mixture evenly into a greased 9x13-inch baking dish.
Sprinkle shredded cheddar and mozzarella cheese over the beef mixture.
Arrange frozen French fries in a single layer on top of the cheese.
Bake uncovered for 35–40 minutes, or until fries are golden and crispy.
Let cool for 5 minutes before serving.
Add additional cheeseburger toppings, if desired. Enjoy!