Preheat the oven to 350 degrees F. Line regular sized cupcake pans with 24 liners.
the flour, sugar, cocoa, baking soda
, baking powder, and salt in a mixing bowl fitted with a paddle attachment. Mix on low until incorporated, about 30 seconds.
In a separate bowl, combine the egg
yolks, egg whites, milk
, oil, water, and vanilla. Add the liquids to the dry ingredients in 3 stages, scraping down at each addition and beating for about 30 seconds.
Fill the cupcake liners three-quarters full and bake until baked through, 18 to 20 minutes. Cool completely.
Fill a piping bag with the slightly chilled Chocolate Ganache
. Cut the tip of the bag off and insert the tip into the center of a cooled cupcake. Squeeze to allow a small amount of mixture into the center. Release and remove the bag from the cupcake. Repeat on the other cupcakes. Generously frost the top of each cupcake with Peanut Butter
with remaining Chocolate