- Mix flour with salt and add water and prepare dough. Usually its little less than half cup for 1 cup flour. Prepare dough and let it rest for 15 mins. After 15 mins, knead again to make it smooth and divide into equal sized balls. Roll it as you do for chapati. Spread the nutella and Heat tawa and toast both sides with few drops of oil. Then take off the chapathi and place chopped banana in centre and roll it and serve.