Preheat your oven to 400℉ (200℃) and line a baking sheet with parchment paper.
Fit your food processor with the dough blade. Pulse together the flour, baking powder, and salt until well mixed.
Add the cold, cubed butter and pulse until the mixture resembles coarse crumbs.
In a small bowl, mix together ⅓ cup of buttermilk, maple syrup, and mashed sweet potato.
Pour this mixture into the food processor and pulse until the dough just comes together.
Transfer the dough onto a lightly floured work surface and gently knead it into a disk about 1 inch thick.
Using a 2¾ inch cookie cutter, cut the dough into biscuits and place them onto the prepared baking sheet.
If desired, brush the tops with additional buttermilk for a golden finish.
Bake for 12 to 15 minutes, until lightly browned. Remove and let cool slightly before serving.
