In a bowl, add all the remaining ingredients mentioned in the list except the onion and vegetable oil and mix well. Add the boiled potatoes to it and mix again so that the potatoes are coated well in the masala. You can bake this immediately or keep this aside for 30 minutes or refrigerate it overnight, and bake it the next day.
⅔ cup Yogurt, 2 to 3 Green chilies, 4 cloves Garlic, 1 inch Ginger, 1 tsp Red chile powder, 1 tsp Dried mint leaves, ½ tsp Turmeric powder, ½ tsp Chat Masala, 2 tsp Tandoori Masala powder, 1 ½ tsp Salt