RED VELVET WHOOPIE PIES

Steps:

• Make the cookies: Preheat the oven to 375 degrees F. Line 2 large baking sheets with parchment paper. Combine the semisweet and milk chocolate in a microwave-safe bowl and microwave at 50 percent power until melted, about 2 minutes. Whisk until smooth.
• Whisk the melted butter, sour cream, eggs, vinegar, vanilla and food coloring in a bowl until combined. In another bowl, whisk the flour, sugar, cocoa powder, baking powder, baking soda and salt.
• Add the flour mixture to the butter mixture in four equal batches, whisking each batch completely before adding the next. Stir in the melted chocolate.
• Scoop heaping tablespoonfuls of batter onto the prepared baking sheets and smooth the tops with a damp finger. Bake until the cookies spring back when lightly pressed, 8 to 10 minutes. Let cool 10 minutes on the baking sheets, then transfer to racks to cool completely.
• Meanwhile, make the filling: Beat the cream cheese and butter with a mixer until smooth. Beat in the confectioners' sugar and vanilla seeds. Sandwich a heaping tablespoonful of filling between 2 cookies; repeat with the remaining cookies and filling. Refrigerate 30 minutes before serving.