Sweet Potato Biscuits - Once Upon a Chef

Ingredients

• 1 cup mashed sweet potatoes, (from 1 medium sweet potato (see note))
• ½ cup whole milk, (plus 2 more tablespoons as needed)
• 1⅔ cups all-purpose flour, (spooned into measuring cup and leveled-off)
• 2 tablespoons cornstarch
• 2½ tablespoons sugar
• 1 tablespoon baking powder
• 1¼ teaspoon salt
• ½ cup (1 stick) cold unsalted butter, cut into small chunks
• ½ cup (1 stick) unsalted butter, softened
• 2 tablespoons honey
• ¼ teaspoon ground cinnamon