Prepare the Dough: In a bowl, combine the room temperature egg and warm milk. Mix well.

Add instant dry yeast and sugar to the mixture. Stir until the yeast and sugar are fully dissolved.

In a separate bowl, whisk together bread flour and salt.

Gradually add the wet mixture to the dry ingredients, mixing until they are well combined.

Use a hand kneader or your hands to knead the dough until it is smooth and free of raw flour.

Incorporate 30g of melted unsalted butter into the dough, kneading until it is fully integrated.

Allow the dough to ferment in a warm place (36-39°C or 97-102°F) for about 1 hour, or until it has doubled or tripled in size.

Prepare the Filling: Peel and cut the potatoes into chunks. Boil in salted water until tender, about 15-20 minutes.

Drain the potatoes and mash them while hot. Season with salt and pepper to taste.

Stir in 40g of heavy cream or milk to achieve a smooth, creamy consistency. For a different twist, you can substitute sweet potatoes or sweet pumpkins.

Add 140g of mozzarella cheese to the mashed potatoes, and mix well. Optionally, mix in other cheeses for extra flavor.

Assemble the Bread: Once the dough has risen, gently deflate it by pressing it down. Divide the dough into 2 equal parts.

Shape each portion into a ball, then flatten on a floured surface into a round shape.

Place the dough rounds on an oven pan, spreading them out slightly.

Spread the prepared mashed potatoes evenly over each dough round.

Sprinkle additional mozzarella cheese or your choice of cheeses over the potatoes.

Fold the edges of the dough over the filling to seal it, and press down to tidy up the ends.

Cover the pan with plastic wrap and let the dough rest for 10-20 minutes to allow it to rise slightly.

Bake: Preheat your oven to 160°C (320°F).

Brush the tops of the dough with milk to achieve a golden color during baking.

Bake in the preheated oven for 30 minutes, or until the tops are golden brown and the bread is cooked through. Baking time may vary depending on your oven.

After baking, brush the tops with melted unsalted butter for a shiny finish and extra flavor.

Garnish with parsley if desired, for a touch of color and freshness.

Serve and Enjoy: Let the potato buns cool slightly before serving. Enjoy them warm as a delicious brunch option or a comforting snack.