Preheat the oven to 350 °F (177 °C). Spray a rimmed baking sheet with non-stick spray.
Place the olive oil in a large skillet. Add the onion, and stir while frying this, until the onion is softened. Add the ground beef and scramble fry this until there is no pink left. Drain off as much fat as you can. Stir in the worcestershire sauce, mayonnaise, seasoned salt, salt, pepper, and garlic powder. Remove this from the heat.
Cut the whole block of slider rolls in half and 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.
Notes
You can easily half this recipe and make 12 sliders instead but 24 works great for large families and get-togethers!