Preheat the oven to 350°F.

Line a rimmed baking dish with foil or parchment paper.

Place the ground beef in a large bowl.

Add the salt, black pepper, and garlic powder to the beef.

Mix gently until just combined, stopping as soon as the seasoning is evenly distributed.

Press the beef evenly into the prepared baking dish, smoothing the surface so the thickness stays consistent.

Bake the beef for 15 minutes, until fully cooked through but still juicy.

Carefully drain off any excess grease.

Lay the halved cheese slices evenly across the hot beef.

Loosely cover the dish and return it to the oven for 3 minutes, just until the cheese melts.

While the cheese melts, slice the slider buns horizontally.

Brush the cut sides of the buns with melted butter.

Toast the buns briefly if desired for added structure.

Remove the beef from the oven and cut it into slider-sized squares.

Assemble each slider with a piece of cheeseburger, a bun, and any optional toppings you choose.

Serve warm.