Chocolate Cupcakes with Chocolate Cream Cheese Frosting

Cupcakes:
Preheat oven to 350 degrees. Line cupcake pans with 24 paper liners. Set the pans aside. Place the cake mix, cocoa powder, sour cream, oil, water, eggs and vanilla in a large mixing bowl. Blend with an electric mixer on low speed for 1 minute. Scrape down the bowl, and increase the speed to medium, beating for another 2 minutes. Pour the batter into the lined cupcake pans, filling each cupcake about three-quarters of the way full. Bake for 28-30 minutes or until a toothpick inserted near the center comes out clean. Cool. Frost with frosting.

Frosting:
Place cream cheese and butter in a large mixing bowl. Blend with an electric mixer on low speed until combined. Add the cocoa powder, vanilla, and comfectioners’ sugar and blend with the mixer on low speed until the ingredients are moistened. Increase speed to medium and beat until the frosting is fluffy. Use at once to frost the tops of the cupcakes.