To prepare stuffing follow the steps shown in Potato Bread Recipe.
To make batter, combine all the ingredients mentioned for batter except water in a mixing bowl and mix using whisk to make smooth paste. If the batter is too much thick, add cold water slowly and mix so that it becomes thin. To check the consistency drop the batter from spoon if it drops easily then its ready.
Take a piece of bread slice, and cut into two pieces of triangular shape. Similarly cut rest of the slices.
Now take a triangular piece and spread potato stuffing onto one side of it using spoon. Dip that slice in prepared batter and then coat in crumbs, similarly prepare other sandwiches. Deep fry all the sandwiches one by one in preheated oil at medium heat until becomes light golden in color.