Heat the oil in a large pan over medium-high heat.
Next, place the ground beef in the pan and season it with salt and pepper to taste. Cook for 6-8 minutes, breaking up the meat with a wooden spoon until browned.
Transfer to the slow cooker with the rest of the ingredients. Stir to combine.
Cook on HIGH for 3 hours or LOW for 6 hours.
Spoon the meat onto the hamburger buns, with a slice of cheese, then serve.
