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Steam the potatoes: Boil or steam whole, unpeeled potatoes until tender throughout (12–15 minutes under pressure). Drain, cool on a wire rack for 10 minutes, peel, and chill uncovered in the refrigerator for 20 minutes.
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Grate and mix: Grate chilled potatoes using a medium box grater into a large bowl. Add minced onion, green chillies, ginger, chili powder, cumin, coriander powder, garam masala, amchur, salt, fresh herbs, and 2 tablespoons of cornstarch. Fold gently into a cohesive dough.
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Shape: Lightly oil hands. Divide mixture into 8 balls (approx. 60g each). Flatten into ½-inch thick smooth patties without edge cracks. Chill for 15 minutes.
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Dredge: Whisk 1 tablespoon flour, remaining cornstarch, and water in a bowl to make a light slurry. Place breadcrumbs in a second plate. Dip each patty lightly in slurry, then coat evenly in breadcrumbs.
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Pan-fry: Heat oil in a skillet over medium heat to 175°C (350°F). Fry patties in batches of 3–4 for 3–4 minutes undisturbed until a deep golden crust forms. Flip and fry for 2–3 minutes more until crisp.
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Drain: Transfer to a wire rack. Dust with chaat masala and serve warm.