Heat a frying pan over medium-high heat. Add the beef mince and cook until browned, breaking it up very finely as it cooks. Add the onion and cook for another few minutes until softened. Add the garlic, ketchup, pickles, mustard, smoked paprika, onion powder, garlic powder, Worcestershire sauce, salt and pepper. Cook for another 1–2 minutes until everything is well combined. Then add the cheese slices with a splash of water so they melt through the beef.