Cook the Sweet Potatoes: Peel and cut the sweet potatoes into chunks. Boil them in water until fork-tender, about 12–15 minutes. Drain thoroughly and allow them to cool slightly before mashing.
Prepare the Beetroot: Peel and finely grate the beetroot. Heat a small pan over medium heat and cook the grated beetroot for 4–5 minutes, stirring occasionally, until it softens and releases some moisture. Let it cool completely.
Mash the Vegetables: Place the cooked sweet potatoes and boiled potato in a large mixing bowl. Mash until mostly smooth, with no large lumps. Add the cooled beetroot and mix well.
Add the Seasonings: Stir in the chopped coriander, green chili, ginger, cumin powder, garam masala, chaat masala, red chili powder, and salt. Mix until the spices are evenly distributed.
Bind the Mixture: Add the breadcrumbs and cornstarch. Mix until the ingredients form a soft mixture that holds its shape when pressed. If it feels too wet, add a little more breadcrumbs, one tablespoon at a time.
Shape the Tikkis: Divide the mixture into 12 equal portions. Roll each portion into a ball and gently flatten it into a round patty. Keep the thickness even so the tikkis cook uniformly.
Pan-Fry Until Golden: Heat the vegetable oil in a nonstick frying pan over medium heat. Place the tikkis in a single layer without overcrowding the pan. Cook for 3–4 minutes on each side until golden and crisp. Transfer to a paper towel-lined plate.
Garnish and Serve: Arrange the warm tikkis on a serving plate. Garnish with fresh coriander and serve with mint chutney, tamarind chutney, or your preferred dipping sauce.