Place the ground beef in a large skillet over medium heat and cook until it is no longer pink, breaking it up with a spoon as it browns.
Add the chopped onion to the skillet and cook for 3 to 4 minutes until the onion softens.
Stir in the ketchup, brown sugar, Worcestershire sauce, salt, and black pepper. Lower the heat and let the mixture simmer for 5 minutes so the flavors blend and the sauce thickens slightly.
While the beef simmers, bring a large pot of water to a boil. Add the corn and cook for 5 to 7 minutes until the kernels are tender.
Drain the corn, then spread the butter over each ear and sprinkle lightly with salt if desired.
Split the slider buns, spoon the beef mixture into each bun, and serve the sliders alongside the corn.