Made with cake mix, these Chocolate Whoopie Pie Monsters turn a basic chocolate whoopie pie recipe into a fun Halloween treat that the whole family will love. Stuffed with a creamy marshmallow filling, these monster treats are hard to resist!
1. Preheat the oven to 350°F. Add all of the cake ingredients to a large bowl and beat with a hand mixer on low until combined and then on high for an additional minute to add a bit of air to the mixture.
2. Pour the batter into a piping bag with a wide round and smooth tip or large resealable bag and cut a corner off. Pipe batter into small circles onto cookie sheets about 1-inch apart to allow for spreading. Continue to do this in batches until the batter is used.
3. Bake 10 to 12 minutes until set being careful to not over bake. Let the cakes cool 2 minutes; remove from cookie sheets and place on cooling rack. Cool them mpletely before filling.