Sweet Potato Cupcakes with Cinnamon Frosting

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Cupcakes:

2 cups all-purpose flour

1 1/2 teaspoons baking powder

1 teaspoon ground cinnamon

1/2 teaspoon ground ginger

1/4 teaspoon freshly grated nutmeg

1/2 teaspoon fine sea salt

1/3 cup vegetable oil

3/4 cup packed light or dark brown sugar

1 large egg, at room temperature

1 teaspoon pure vanilla extract

1/2 cup buttermilk

1 cup sweet potato puree

Cinnamon Frosting:

8 ounces cream cheese, at room temperature

1 stick (1/2 cup) unsalted butter, at room temperature

3 cups confectioners? sugar

1 tablespoon ground cinnamon, plus more for finishing (optional)

2 teaspoons pure vanilla extract

Pinch fine sea salt