Preparation
Mix all the ingredients in a medium-sized bowl―ketchup, oats, egg, ground beef, brown sugar, and onion. Sprinkle the mixture with some salt and pepper. Once done, shape it into patties. Place a skillet over medium heat. Fry the patties on both the sides, for at least 4 minutes each or as required. Place them between the buns, along with some lettuce, cheese slices, and ketchup, and serve.