Preheat oven to 400 degrees. Line a baking sheet with parchment paper.
Fit the food processor with the dough blade (the dull blade). Pulse together the flour, baking powder, and salt together. Add in the butter and pulse until it lookd like peas (see photo).
Mix together ⅓ cup buttermilk, maple syrup, and sweet potato together.
Add to dough and pulse until dough just comes together.
Pour dough onto a floured work surface and gently knead the dough together into a disk. Pat down to 1 inch thickness using your hands. Use a 2-¾ inch circle cookie cutter to cut into biscuits.
Place onto the baking sheet and brush with additional buttermilk if desired for a golden exterior.
Bake for 12-15 minutes, until browned.
Notes
¾ sweet potato puree is equal to the flesh of 1 medium sweet potato.