In a bowl, mix bread flour and salt.

Pour in the milk and mix with the dry ingredients.

Add melted butter and continue to stir until the dough comes together.

Knead the dough by hand until it's smooth.

Shape the dough into a ball and pinch the seams to close it.

Cover the dough with plastic wrap and refrigerate for 1 hour.

Peel one medium-sized potato.

Cut the potato in half and boil until it is fork-tender.

Drain the potato and mash it until smooth.

Add sugar to the mashed potato and mix until well combined and smooth.

Spread the potato filling on a piece of plastic wrap and flatten it into a disc.

Take the dough from the refrigerator and roll it out into a flat circle.

Sprinkle a layer of shredded cheese on the dough.

Place the flattened potato filling in the center on top of the cheese.

Sprinkle more cheese on top of the potato filling.

Fold the edges of the dough over the filling and pinch them together to seal.

Flip the sealed dough over and gently roll it with a rolling pin to flatten it into a large disc.

Melt butter in a large pan over medium heat.

Carefully place the bread in the hot pan.

Brush the top surface of the bread with more melted butter.

Flip the bread and cook until the second side is golden brown.