Preheat the oven to 350 degrees. Place a silicone baking mat on a rimmed baking sheet, or spray sheet with non-stick spray.
Place the oil into a large skillet. Add the onion, and cook, stirring occasionally, until soft and translucent. Add ground beef and cook until there is no pink remaining. Drain off as much fat as possible.
Stir in the worcestershire sauce, mayonnaise, seasoned salt, salt, pepper, and garlic powder. Mix until well combined. Remove this from the heat.
Cut the entire block(s) of slider rolls in half, creating a top and bottom. Place the bottom halves into the baking dish. Evenly cover the bottom layer of slider buns with all of the ground beef. Sprinkle the 2 cups of grated cheese over the beef. Add the top halves of the buns.
Brush the tops of the buns with the melted butter. Sprinkle on the sesame seeds.
Bake for 10-12 minutes or until the cheese is melted and the tops are golden brown.