INSTRUCTIONS
COOKIES
- Preheat oven to 375 degrees F. Line two baking sheets with parchment paper.
- In a medium bowl, whisk the flour, cocoa powder, baking soda, and salt until combined.
- In the bowl of a stand mixer, beat the butter and brown sugar for 2 minutes using the paddle attachment until light. Add egg and vanilla, then beat again, scraping the bottom and sides of the bowl.
- Alternate adding the flour mixture with the buttermilk, beating after each addition and scraping the sides of the bowl, just until combined.
- Use a small to medium cookie scoop to drop batter onto the parchment-lined baking sheets, spacing them 2-3 inches apart. If you want 8 really large whoopie pies, you should do 16 scoops of batter. For more reasonably sized whoopie pies, do 20 to 24 scoops of batter to make 10-12 whoopie pies.
- Bake for 10 to 12 minutes, until just done around the edges and the tops bounce back when lightly touched. Cool on the baking sheet for 5 minutes before transferring the cookies to a wire cooling rack to cool completely.
FILLING
- Combine the shortening and powdered sugar in a large bowl. Beat well using a hand mixer or stand mixer until smooth. Add marshmallow fluff and vanilla extract, then beat again, scraping the sides of the bowl so everything gets evenly combined.
ASSEMBLY
- Pipe a generous amount of frosting onto the flat bottom of one cookie, then top with another cookie to make a whoopie pie. Repeat with the remaining cookies and filling.
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