Add the prawns, ginger, garlic, green chili, mint, cilantro, and onion to a food processor. Pulse briefly until the mixture is coarsely chopped but not turned into a smooth paste.
In a large bowl, combine the mashed potatoes with Kashmiri chili powder, turmeric, garam masala, cumin powder, chaat masala, lime juice, and salt.
Add the prawn mixture, squeezed bread, gram flour, and breadcrumbs to the potatoes. Mix until everything is evenly combined and the mixture is firm enough to shape. Add a little more gram flour if it feels too sticky.
Divide the mixture into 10 portions and shape each one into a round, slightly thick patty. Coat each cutlet evenly with breadcrumbs, gently pressing them onto the surface.
Heat the oil in a skillet over medium heat. Once hot, carefully place a few cutlets in the pan without overcrowding them.
Shallow-fry the cutlets for about 4 to 5 minutes per side, turning gently, until they are crisp and golden brown and the prawns are fully cooked.
Transfer the finished cutlets to a paper towel-lined plate to drain. Serve hot with lime wedges, green chutney, or your favorite dipping sauce.