Preheat oven to 350 F. Lightly grease a 9x13-inch baking dish with non-stick cooking spray.
In a large skillet, brown the ground beef with the minced onion and garlic powder. Drain if needed.
Place the bottom buns into the prepared baking dish. Add a single layer of shredded cheese onto the buns, then top with the browned ground beef, then ketchup (optional) and more shredded cheese. Place the top buns on top.
Melt the butter and then brush onto the tops of the buns. Sprinkle the garlic or seasoning salt onto the melted butter.
Bake in the preheated oven for 10 to 15 minutes. Let cool a few minutes before pulling apart and serving.
Serve Baked Cheeseburgers with side of chips, fruit, veggies or baked beans.