1/2cupunsweetened dutch process or special dark cocoa powder
1tspbaking powder
1/2tspbaking soda
1/4tspsalt
1/2cupbuttersoftened
1/2cupgranulated sugar
1/2cuppacked light brown sugar
1large egg
1tsppure vanilla extract
1cupmilk or buttermilk
Filling:
4Tbspunsalted buttersoftened
4ozcream cheesesoftened
1tsppure vanilla extract
1cuppowdered sugar
17.5 ozcontainer marshmallow fluff
2Tbspheavy creamplus additional as needed
Instructions
Preheat the oven to 350°F. Line 2 large baking pans with parchment, silicone baking mats, or spray with baking spray. Set aside.
Whoopie Pies: In a medium-size mixing bowl use a whisk to sift together flour, cocoa, baking powder, baking soda and salt
Using an electric mixer cream together butter, granulated sugar, brown sugar and vanilla until fluffy, about 1-2 minutes. Add the egg, beat until incorporated.
Add the dry ingredients alternately with the milk beginning and ending with dry ingredients. Beat on medium speed just until fully incorporated.
Using a medium ice cream scoop, drop mounds onto baking sheets, leaving at least 2 inches between. Bake for 8-10 minutes or until a toothpick inserted into the center comes back clean. Cool on the pan for 5 minutes then remove to a cooling rack to cool completely.
Filling: Using an electric mixer, cream butter and cream cheese with vanilla. Lower the speed of the mixer gradually adding the powdered sugar. Once combined, add marshmallow cream, then beat on high for 2 minutes. (Only use cream if needed for spreading consistency. To make a stiffer filling, don't use.)
Divide filling evenly among half of the rounds. Top each with a matching size round. Store in an airtight container separated by wax paper for up to 3 days. Bring to room temperature for serving.