Mint chocolate Brownies

I made these for a baby shower and they were soooo yummy. recipe found here.

For the cakes:
Bake Devil's Food cupcakes according to the box directions, adding one teaspoon of peppermint extract to the batter.

For the frosting:
Mix 3 sticks of soft butter, 4 1/2 cups of powdered sugar, 3 tablespoons of milk, 2 teaspoons of peppermint extract, and a few drops of green food coloring.

To decorate:
Fill a pastry bag with the frosting. (A gallon-sized ziploc works great--just snip a hole in one corner of the bag.) Swirl the frosting around the cake--I like to start on the outside and work my way in. Finally, drop a little handful of chocolate chips on top. (I recommend using a good brand of chocolate chips for this, as generic chips often have an uneven color.)