This is one of my favorite cupcake recipes. It is from one of Emily's cupcake books.
Cupcakes by Pamela Clark.

White Chocolate Mud Cake

1 stick butter, chopped coarsely
3 oz white chocolate, chopped coarsely
1 cup sugar
1/2 cup milk
1/2 cup all purpose flour
1/2 cup self rising flour
1 egg
1) Preheat oven to 325, Line muffin cups with paper cups (12).
2) Combine butter,chocolate,sugar and milk in small pot;
stir over low heat until smooth. Trhansfer mixture to medium bowl;
cool 15 minutes.
3) Whisked in sifted flours; then egg, you could also blend in vanilla, coconut or
any flavoring at this point. Then fill muffin cups.
4) Bake cupcakes 30 minutes.
5) Frost with you favorite frosting. I love cream cheese or a buttercream.

These are frosted with this:

Vanilla Bean Buttercream Frosting Recipe
I got this from http://www.cupcakeproject.com/
1 1/2 C confectioners' sugar (add more until it reaches your preferred consistency)
1/2 C butter (room temperature)
2 teaspoons vanilla bean paste (add more to taste) I love this stuff!!!!
1 tablespoon milk
Mix together sugar and butter until they are blended and creamy. Add vanilla bean paste and milk and continue to beat for another minute. If desired, add more vanilla bean paste to taste, or more confectioners' sugar to make it stiffer.

                                                  Boxed and ready to go for a bridal shower.