Add whole wheat flour and salt in a bowl and knead it by adding little by little water to make a smooth and stiff dough.
Add 1 tbsp vegetable oil and knead again. Set it aside for 15-20 minutes.
Take a bowl and add mashed potatoes, ajwain, salt, garam masala, chopped green chillies, chopped coriander leaves, red chili powder and mix it well.
Dust the ball with dry floor and roll out a portion of dough using rolling pin.
Make a small ball of the filling and place it in the center.
Now start closing it from all ends. Lightly dust it with dry flour and roll it evenily in a round shape using a rolling pin.