Mint Chocolate Whoopie Pies feature decadent, moist, fluffy cocoa cakes sandwiched together with a fresh, creamy mint filling. This delicious recipe is quick, easy to make, and sure to be a hit for St. Patrick's Day, Christmas, or anytime the mint chocolate dessert craving strikes.
Sift the flour, cocoa powder, baking soda, and salt into a medium bowl.
In the bowl of an electric mixer fitted with the paddle attachment, beat the butter and brown sugar on low speed until combined. Increase speed to medium high and beat for 3 minutes, or until light and fluffy. Scrape down the sides of the bowl. Add the egg and vanilla and beat on medium-high speed for another 3 minutes, or until very well combined.
Use a medium 1 ½-tablespoon spring-loaded scoop to drop mounds of batter onto prepared baking sheets, spacing 2 inches apart. Bake for 11 minutes, or until pies spring back slightly when pressed gently and appear dry on top. Let cakes cool on pans for 5 minutes before moving to a wire rack to cool completely.
In the bowl of a stand mixer fitted with the paddle attachment, add the powdered sugar and butter. Mix on low speed until well blended and then increase the speed to medium and beat for another 3 minutes, or until the mixture is completely smooth. Scrape down the sides and bottom of the bowl as needed. Add the salt, peppermint extract, and cream and beat on medium for 1 minute, or until light and creamy, adding more cream if needed. Add in green gel food coloring, if desired, and beat until evenly colored.
Use a medium 1 ½-tablespoon spring-loaded scoop to dollop filling on the flat side of half the whoopie pies. You could also use a piping bag fitted with a decorative tip. Sandwich gently with the remaining whoopie pies.
Store at room temperature in an airtight container for up to a day or in the fridge for up to 4 days. Best served at room temperature so the buttercream filling has time to soften. If transporting, chill the whoopie pies in the fridge for at least an hour before transporting to make firmer and less fragile.
*Make sure to use peppermint extract and NOT mint or spearmint.
Chocolate Whoopie Pies with Mint Filling March 9, 2023