Boil the sweet potatoes, peel them, and mash them.
Add sugar and salt to the mashed sweet potatoes and mix well.
Combine flour, yeast, milk, and butter to make a dough.
Let the dough rise for the first fermentation.
Divide the risen dough into equal portions and flatten them.
Place the sweet potato filling and cheese on the dough and wrap them up.
Shape the dough and place on a baking tray.
Brush the top with egg wash.
Bake in a preheated oven at 180°C for 20 minutes.