Chocolate Peanut Butter Whoopie Pies

Mmm...these might be my favorite whoopie pies yet! My sister and I both LOVE the combination of chocolate and peanut butter, so for her birthday, I decided to make her some chocolate peanut butter whoopies. The pie part is peanut butter and the filling is salted peanut butter on one side, chocolate frosting on the other. Delicious!

And doesn't she look happy to be eating such a tasty birthday treat?!