Preheat oven to 400°F (200°C).

In a skillet over medium heat, cook ground beef and diced onions until browned. Drain any fat.

Add garlic, ketchup, mustard, and pickles to the skillet. Stir and simmer for 3–5 minutes. Season with salt and pepper.

Spread the beef mixture evenly in a greased 9×13-inch baking dish.

Top the beef with shredded cheddar cheese.

Arrange frozen French fries over the cheese in a single layer.

Bake uncovered for 25–30 minutes until fries are golden and crispy.

Broil for 2–3 minutes if extra crispiness is desired.

Let cool slightly before serving. Add optional toppings like tomatoes or lettuce.