Preheat your oven to 350°F (175°C).

In a bowl, combine ground beef with onion powder, salt, and black pepper.

Shape the beef mixture into patties, about 2 ounces each.

Heat a skillet over medium-high heat and cook the patties for about 3 minutes per side.

In a baking dish, layer half of the slider buns, then add patties, cheese, pickles, ketchup, and mustard. Top with remaining buns.

Cover with foil and bake for 10 minutes until the cheese melts.