In a mixing bowl, combine the mashed potatoes, flour, baking powder, and salt.

Add the melted butter and gradually mix in the milk until a soft dough forms.

Knead the dough on a floured surface until smooth, about 5 minutes.

Divide the dough into four equal pieces and roll each into a round shape about 1/2 inch thick.

Heat a frying pan over medium heat and cook each round for about 5 minutes on each side, until golden brown.

Remove from the pan and let cool slightly before serving.