Peel and boil the chestnuts, then mash them.
Steam the pumpkin, peel, and mash it.
Combine flour, sugar, salt, and yeast in a bowl and mix.
Add the mashed chestnut and pumpkin, milk, and butter, then knead the dough.
Let the dough rise for the first proofing.
Divide the dough and shape into balls.
Place the shaped dough in a pan for the second proofing.
Bake in a 180℃ oven for 20 minutes.