To prepare a sweet potato cupcakes with cinnamon frosting recipe, first you need to prepare the sweet potatoes. First, you will need: Sweet Potatoes. Sweet potatoes are sweet, so you can use any kind you like. If you don't want to cook them, just peel them and cut them into bite-sized pieces. Then, preheat the oven to 350?F (180?C) and prepare your cupcake liners. Fill each cupcake liner with cupcake batter and bake for 18 to 20 minutes, or until the toothpick inserted into the center of the cupcake comes out clean. Let cool in the pan for 5 to 10 minutes before removing to wire rack to cool completely.