01 - Preheat oven to 400°F.
02 - Heat olive oil in a large skillet over medium-high heat. Add diced onion and cook for 3 minutes until softened. Add minced garlic and sauté for 30 seconds until fragrant.
03 - Add ground beef to skillet, breaking apart with spatula. Cook until browned and no longer pink, approximately 7 minutes. Drain excess fat if needed.
04 - Stir in ketchup, yellow mustard, Worcestershire sauce, salt, black pepper, and smoked paprika. Cook for 2 minutes to combine flavors, then remove from heat.
05 - Fold in chopped pickles (if using) and 1 cup of shredded cheddar cheese until evenly distributed.
06 - Transfer seasoned beef mixture to a 9x13-inch baking dish, spreading into an even layer.
07 - Arrange frozen French fries in a single, even layer covering the beef mixture completely.
08 - Bake uncovered for 25 minutes. Remove from oven and sprinkle remaining 1 cup cheddar cheese evenly over fries. Return to oven for 10-12 minutes until fries are golden and cheese is fully melted.
09 - Allow casserole to rest for 5 minutes before serving to set.