Preheat 325 degrees. Grease 11x13 cake pan.
In a bowl combine butter, powdered sugar and vanilla in mixer. Beat until light and fluffy. Slowly add milk in until desired consistency. Should be slightly thick and stiff.
In food processor mix cake until fine crumbles. If you don't have a food processor, break cake into pieces by hand until coarse crumbs.
Mix in 1/2 of the frosting. You don't want to add too much, so start small and add in. Mix in enough to create a dough ball.
Use scoop to create 1 1/2" balls. Place in refridgerator for 15 minutes before dipping.
Melt chocolate in microwave. Add about 1 tbs vegetable oil for every cup of chocolate. This will make the chocolate smooth enough to dip