This recipe makes moist muffins that allow you to fully enjoy the rich flavor of chestnuts. Mix together unsalted butter, granulated sugar, and chestnut paste, then gradually add beaten eggs and emulsify. Add cake flour, baking powder, and milk to make the batter, and mix in chopped candied chestnuts. Pour the batter into muffin tins, decorate with candied chestnuts on top, and bake in the oven until done. This is a perfect treat for enjoying the flavors of autumn, whether for a home café or as a gift.