Start up grill and preheat to 400°F.
Cut potatoes into wedge-shaped eighths.
Put raw wedges in a large bowl filled with hot water. Leave to soak for 10 minutes. Then pat down to dry.
Put wedges in a large bowl and toss with cooking oil until evenly coated. Add the salt, paprika, and black pepper into the bowl. Toss until the wedges are evenly coated in seasoning.
Sprinkle potato flakes over wedges until coated evenly.
Wrap a baking tray or sheet in aluminum foil. Transfer wedges to tray and spread out evenly.
Grill for 20-30 minutes, or until the skin of wedges has turned golden brown and started to develop a crispy exterior.
Remove from grill and serve immediately.