Line a baking/cookie sheet with parchment. Once the dough has risen, punch it down and knead again for 3-4 minutes on a floured surface.
Divide the dough into 12 equal balls.Roll out each ball using a rolling pin into a 2" circle.
Spoon about 1.5 tablespoon of potato filling into the centre of each dough circle. Pinch all sides to make a stuffed dough ball.
Place on the baking sheet, pinched side down.
Stuff all the dough portions similarly and line on the baking sheet 2-3 inches from each other so that they do not touch each other during second rise. You may use more than 1 baking sheet (if required) to line the dough balls.Cover with a cloth and let rise in a warm place for 15 more minutes.
While the buns are proofing, preheat oven to 375 F/190 C
Bake for 15-17 minutes or till they are light brown in color and you smell the aroma of baked dough. Mine took 15 minutes.
Once light brown, brush melted butter on the balls and bake for another 3-4 minutes till the tops turn golden brown.
Pull out the baking sheet and using a pair of tongs, transfer the baked buns to the cooling rack. Cool slightly and serve warm with tomato ketchup. mango mint chutney, green chutney & masala chai.