Peanut Butter Cookie Cupcakes

Peanut Butter Cookie Cupcakes was pinched from <a href="http://www.marthastewart.com/312959/peanut-butter-cookie-cupcakes" target="_blank">www.marthastewart.com.</a>
INGREDIENTS
FOR THE CUPCAKES
1 3/4 cups all-purpose flour
3/4 teaspoon baking powder
1/2 teaspoon salt
1/4 teaspoon baking soda
3/4 cup (1 1/2 sticks) unsalted butter, softened
1 1/3 cups sugar
2/3 cup natural, creamy peanut butter
3 large eggs
1/2 teaspoon pure vanilla extract
1/2 cup sour cream
FOR THE FROSTING
12 ounces cream cheese, room temperature
1 1/2 cups confectioners' sugar, plus more for decorating
3 tablespoons unsalted butter, softened
1 1/2 cups creamy peanut butter
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