Start by preheating your oven to 350°F. Lightly grease a baking dish or line a sheet pan with parchment paper to prevent sticking.
In a small bowl, combine melted butter with garlic powder and a pinch of salt. This will give the tops of your sliders a golden, flavorful finish.
Keep the rolls together as a block and slice them horizontally. Place the bottom halves in your prepared dish for a neat, easy assembly.
Evenly spread shredded cheddar and mozzarella over the bottom halves. Then place the top halves back on, brushing them generously with your garlic butter mixture.
Cover the dish with foil and bake for 10 minutes. Remove the foil and continue baking for another 7–10 minutes until the tops are golden brown and the cheese is fully melted.
Allow the sliders to cool for 2 minutes before slicing between the rolls. This helps them hold their shape while still being gooey and delicious.
Serve these sliders with your favorite dipping sauce or classic tomato soup. Watch the cheese stretch and enjoy every bite.