These sliders are delicious as is but if you want to alter the recipe, then have a look at my suggestions below: - Substitute cheddar cheese for Gruyere cheese or add Parmesan as well. - Add slices of bacon to these sliders for extra meaty flavor. - Add pickled jalapeños in between the meat and cheese for some heat. - Add diced green pepper to the pan when browning the ground beef to resemble a Sloppy Joe.