5.4 ounces dark chocolate or 3/4 of a 200 gram bar of Valrhona 61% cocao
22 tablespoons butter
1-3/4 cups plus 2 tablespoons sugar
6 eggs
1 cup plus 2 tablespoons flour
4-1/2 tablespoons cocoa powder, unsweetened
1-1/2 teaspoon baking powder
pinch of salt

1. Melt chocolate and butter over a water bath.
2. Add sugar and stir, let mixture cool for 10 minutes.
3. Beat in an electric mixer for 3 minutes.
4. Add one egg at a time, mixing for 30 seconds between each
5. Sift the flour, cocoa powder, baking powder, and a pinch of salt into the mixture and mix until blended.
6. Scoop into cupcake cups and bake at 350 F for 25 minutes or until a toothpick comes out clean.

Peanut Butter Filling

4 ounces or 1/2 package of Philly cream cheese
1 cup creamy peanut butter
2 cups sifted powdered sugar
1 tablespoon vanilla extract
2 tablespoons milk

1. Beat cream cheese and peanut butter until combined.
2. Add powdered sugar and vanilla and beat until combined.
3. Add the milk and beat until combined.

Note: This makes a pretty stiff mixture, like the center of a peanut butter cup. If you want something pipe-able, you could add more milk. I wanted to retain the strong peanut butter flavor, so I kept the milk to a minimum.

Update: I think that the filling was too thick. As I was eating a cupcake (I managed to resist them until late last night) the peanut butter filling fell out onto the plate. It wasn't too terribly hard to stick back on the cupcake, but if I were to do these again, I would add more milk to the filling.

Chocolate Ganache

4 ounces bittersweet chocolate
5 ounces semisweet chocolate
1 cup heavy cream
1 teaspoon vanilla
1 tablespoon butter, room temperature
2 cups powdered sugar

1. Chop chocolates and transfer into a heat proof bowl.
2. Heat cream until bubbles form around the edge of the pan, pour cream over the chocolate.
3. Let sit for 1 minute then stir until combined.
4. Add butter and vanilla and stir until combined.
5. Transfer to the bowl of an electric mixture and let cool for 10 minutes.
6. Sift powdered sugar into the mixture and beat until combined.
7. Continue to beat with an electric mixer until lighter in color and creamy.