Wash potatoes under cool water to remove dirt and slice them into thin rounds or small cubes for quicker cooking.

In a large bowl, toss sliced potatoes with melted butter, garlic powder, salt, and pepper until evenly coated.

On a large piece of heavy-duty aluminum foil, pour seasoned potatoes and sprinkle shredded cheese on top.

Fold the foil around the potatoes to create a tight seal, leaving space for air to circulate.

Place the foil packet directly on hot coals or a grill grate over medium heat and cook for 30-40 minutes, flipping halfway.

Carefully unwrap the foil, serve warm garnished with fresh green onions or chives.