Preheat the grill to medium-high heat
Wash the peaches and dry them well
Cut the peaches in half and remove the pits
Brush the cut sides lightly with oil or melted butter
If desired, sprinkle with a little sugar or cinnamon
Place the peaches cut-side down on the grill
Grill for 3 to 5 minutes until grill marks form
Flip and grill the skin side for 1 to 2 minutes if desired
Remove from the grill
Serve warm as desired