Chestnut Sweet Potato Muffins

Steamed and mashed sweet potato is worked directly into the batter, contributing moisture and a gentle, earthy sweetness that keeps the crumb soft for days after baking. The sweet potato also acts as a built-in humectant, preventing the common muffin problem of drying out once cooled. Diced roasted chestnuts are folded throughout the batter to provide a starchy, crumbly counterpoint to the tender surrounding crumb. Their slightly grainy texture creates contrast with every bite. A small amount of cinnamon sharpens the perception of the sweet potato's warmth without masking it. The streusel topping baked onto each muffin provides a layer of buttery crunch that gives way to the soft interior when pressed. When made with freshly harvested autumn ingredients, the natural sugars in both the sweet potato and chestnuts are concentrated enough that the amount of added sweetener in the batter can be reduced. The muffins work well as a snack or a breakfast substitute.