Preheat your oven to 175°C (350°F). Line your baking dish with foil for easy cleanup and set aside.
Slice the buns horizontally, keeping the top and bottom halves connected if possible, and lay the bottom halves in your prepared dish.
Spread a generous layer of barbecue sauce on the cut side of the bottom buns, coating evenly to infuse flavor.
Layer the thin slices of ham over the sauced buns, covering the surface completely for maximum juiciness and flavor.
Sprinkle shredded cheese over the ham for a melty, gooey top after baking, then place the top bun halves over the cheese and ham layers.
Brush the tops of the buns with melted butter mixed with garlic powder for a golden, flavorful finish.
Cover the dish with foil and bake for about 15 minutes, until the sliders are heated through and the sauce is bubbling around the edges.
Remove the foil and broil for 1-2 minutes to achieve a bubbly, caramelized top, watching closely to prevent burning.
Let the sliders rest for 5 minutes out of the oven to allow the juices to settle, then slice into individual servings using a serrated knife.
Enjoy these messy, flavorful sliders warm, with extra barbecue sauce on the side if desired.