Sourdough Sweet Potato Biscuits — Bako Sweet

Ingredients

• 1 cups sweet potato 1 medium-sized
• ¾ cups sourdough discard
• ⅓ cups buttermilk plus more for brushing
• 2 tbsp sugar
• 1 ¾ cups all-purpose flour
• 2 tsp baking powder
• ½ teaspoon baking soda
• 1 tsp salt
• 113 grams unsalted butter cold and cut into 1-inch cubes