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Soft and chocolatey whoopie pies filled with fluffy marshmallow cream — a perfect mix between cake and cookie for a nostalgic, sweet treat.
2 cups all-purpose flour
1/2 cup unsweetened cocoa powder
1 1/4 teaspoons baking soda
1/2 teaspoon salt
1/2 cup unsalted butter, softened
1 cup packed brown sugar
1 large egg
1 teaspoon vanilla extract
1 cup buttermilk
For the Marshmallow Filling:
1/2 cup unsalted butter, softened
1 cup powdered sugar
1 1/2 cups marshmallow creme (such as Marshmallow Fluff)
1 teaspoon vanilla extract
Do not overmix the batter — it helps keep the cakes soft.
Let the cakes cool completely before assembling to prevent the filling from melting.
Store in an airtight container in the refrigerator for up to 4 days.
For a gluten-free version, substitute a 1:1 gluten-free baking blend.
Freeze for up to 2 months with parchment between layers.