I originally was going to make this just another chocolate cake, but had some left-over reeses peanut butter cups, and came up w/ this. If you love chocolate and peanut butter, you'll love this easy to make cake. Why not make it for valentine's day?
Let cool. Place light cream in microwave-safe bowl and microwave until gently boiling. Place dark chocolate in a bowl, pour cream over chocolate. Whisk until chocolate is melted. Whisk in peanut butter. Frost cooled cakes w/ frosting.