Name: Peanut Butter Whoopie Pies
Prep time: 5 min
Cook time: 15 min
Yield: 10 servings
Ingredients: Cake; 1 3/4 cups all-purpose flour; 3/4 cup unsweetened baking cocoa powder; 1 1/2 teaspoons baking soda; 1/2 teaspoon fine salt; 4 tablespoons unsalted butter (, softened); 1/4 cup vegetable shortening; 1/2 cup granulated sugar; 1/2 cup packed dark-brown sugar; 1 large egg; 1 cup whole milk; 1 teaspoon pure vanilla extract; Buttercream filling ((recipe follows):); 2/3 cup natural (, creamy peanut butter); 1 stick unsalted butter (, softened); 3/4 cup confectioners' sugar; Fine salt (, to taste)