Preheat the Oven: Set your oven to 350°F (175°C) and lightly grease a 9×13-inch baking dish.
Cook the Ground Beef: In a large skillet, cook the ground beef over medium heat until browned and no longer pink, breaking it apart with a spatula as it cooks. Season lightly with salt and pepper. Once cooked, drain the excess grease and transfer the meat into the prepared baking dish.
Mix the Sauce: In a small mixing bowl, combine the dill pickle relish, ketchup, mustard, minced garlic, and cream of mushroom soup. Stir until the mixture is smooth and well blended. This creates a creamy, tangy sauce that ties the casserole together and gives it that signature “cheeseburger” flavor.
Assemble the Casserole: Pour the sauce mixture evenly over the cooked ground beef, spreading it with a spatula to cover the entire surface. Sprinkle the shredded cheddar cheese on top to create a gooey, melty layer.
Add the French Fries: Arrange the frozen French fries evenly over the top of the casserole, covering the cheese completely. You can use straight-cut fries, crinkle-cut, or even waffle fries — whatever your family loves most!
Bake: Place the casserole in the preheated oven and bake uncovered for about 40 minutes, or until the fries are golden brown and crisp on top, and the casserole is bubbling around the edges.
Serve: Remove from the oven and let it cool for a few minutes before serving. Scoop generous portions onto plates and enjoy the comforting combination of juicy beef, creamy sauce, melted cheese, and crispy fries all in one bite.
