Prep Time 35 minutes mins
Cook Time 10 minutes mins
Total Time 45 minutes mins
For The Whoopie Pies:
- 1 2/3 cups all-purpose flour
- 2/3 cup Dutch-process cocoa powder
- 1 1/2 teaspoons baking soda
- 1/2 teaspoon fine sea salt
- 1 stick unsalted butter at cool room temperature
- 1 cup lightly packed dark brown sugar
- 1 large egg at room temperature
- 1 teaspoon vanilla extract
- 1 1/4 cups buttermilk at room temperature
For the Marshmallow Filling:
- 297 grams marshmallow creme fluff
- 15 tablespoons unsalted butter at cool room temperature
- 1 cup powdered sugar sifted
- 1 ½ tablespoons vanilla extract
- ½ teaspoon fine sea salt