Prepare heavy foil by tearing off two large pieces and stack together. spray top piece well will cooking spray.
Slice potatoes into thin rounds with slicer. Place on foil and toss with olive oil. Add the rest of ingredients and toss again.
Wrap and fold both pieces of foil together into a sealed package. Try to leave potatoes in a single layer as much as possible.
Place on hot grill cover and cook on moderate heat one hour.