Frankenstein Chocolate Whoopie Pie! The classic, chocolate whoopie pie gets a Halloween monster makeover in these delicious, hand-held treats!
Preheat the oven to 350°F. Line a cookie sheet with parchment paper.
In a medium mixing bowl, sift or whisk together the flour, cocoa powder, baking powder, baking soda, and salt. In a large mixing bowl, beat together the butter and both sugars until light and creamy. This will take about 3 minutes if using an electric mixer or 5 to 6 minutes if creaming by hand.
Add the eggs and vanilla, and beat to combine. Add the buttermilk and dry ingredients in alternating batches, beating until incorporated.
Using a medium cookie scoop, scoop the batter, placing 2 inches apart on the prepared cookie sheet. Bake for 13 to 14 minutes, until the tops are puffed up & slightly cracked. Let the cookies rest 5 minutes before transferring.
Make Filling: In a large bowl, beat together the butter, confectioners’ sugar, milk, and vanilla until light and fluffy, 1 to 2 minutes.
Transfer the filling to a resealable plastic bag and snip off one corner of the bag. Once the cookies are completely cooled, pipe a swirl on the bottom (flat) side of half of the whoopie pies. Add the top cookies, flat-side down, and gently press together.
To "Monsterfy" your Whoopie Pies, simply tint your frosting with some green food coloring before piping. Place 2 candy eyes on each whoopie pie, and 2 mini marshmallows on each side to make Frankenstein's "bolts." Finish off by piping "stitches" using melted white chocolate or frosting.