Preheat the oven to 350 degrees F. Line a cupcake pan with 18 paper liners, set aside.
Make the sweet potato puree by processing the sweet potatoes in a food processor. Set aside. In a medium bowl, whisk together the flour, cinnamon, baking powder, baking soda, salt, ginger and nutmeg.
In a large bowl, whisk together the butter, brown sugar, granulated sugar and eggs. Add the dry ingredients. Whisk in the sweet potato puree. Fill each cupcake in the prepared pan three-quarters full of batter.
Bake until the tops spring back when touched and a toothpick inserted in the center comes out clean, 20 to 25 minutes. Let cool.
To assemble: Frost the cupcakes with the Brown Sugar Cream Cheese Frosting. Sprinkle with the Candied Pecans.
In a mixer fitted with the paddle attachment, beat the cream cheese until creamy. Add the butter and beat until well incorporated. Add the light brown sugar and beat until fluffy. Add the powdered sugar 1 cup at a time, beating until well incorporated. Add the vanilla extract and beat until combined.
Preheat the oven to 300 degrees F. Spray a baking sheet with nonstick cooking spray.
Beat the egg white in a bowl until frothy; whisk 4 teaspoons water and the vanilla extract into the egg. Stir the sugar, cinnamon and salt into the egg mixture. Add the chopped pecans, stir to coat completely. Spread the pecans onto the baking sheet. Bake the pecans, stirring about every 20 minutes, until the coating forms a glaze, about 1 hour. Allow to cool on the baking sheet.
This recipe was created by a contestant during a cooking competition. It has not been tested for home use.