2 cups all-purpose flour
1 tablespoon baking powder
1 tablespoon granulated sugar
1/2 teaspoon fine salt
1/4 teaspoon baking soda
3/4 cup whole milk
1 cup baked, mashed sweet potato (about 1 medium potato)
8 tablespoons unsalted butter (1 stick), frozen
Heavy cream, for brushing the tops
INSTRUCTIONS
1,Heat the oven to 400°F and arrange a rack in the middle. Combine all dry ingredients in a large mixing bowl and set aside. In a separate large bowl, mix together milk and mashed sweet potato until evenly combined.
2,Grate frozen butter through the large holes of a box grater and toss with dry ingredients until butter is coated. Add milk mixture and mix lightly until dough forms a shaggy mass.
3,Turn out mixture onto a floured surface and knead just until it comes together. (The dough will not be smooth.)
4,Pat into a circle and use a floured rolling pin to roll dough to a thickness of about 3/4 inch. Using a 3-inch biscuit cutter, cookie cutter, or glass, cut the dough into rounds. Gather leftover dough into a circle, reroll, and cut until you have 8 large biscuits.
5,Place biscuits on a baking sheet, brush tops with heavy cream, and bake until the bottoms are golden brown, about 12 to 15 minutes.