Marinated in spiced yoghurt, Kashmiri chillies, and garlic, then roasted over roaring tandoor charcoal embers with charred edges.
Combine the mashed potatoes, cornflour, green chilies, cumin powder, Kashmiri chili powder, garam masala, and salt.
With oiled hands, shape into round flat tikkis; chill 20 minutes.
Cook over medium-high heat or under a grill, basting with oil.
Grill until crisp and golden-charred on both sides.
Serve topped with whisked yogurt, mint chutney, and a sprinkle of chaat masala.