Chocolate Whoopie Pies with Marshmallow Filling (Printable Version)

Soft chocolate sandwich cookies with fluffy marshmallow filling—classic American dessert

# What You Need:

→ Chocolate Cookies

01 - 2 cups all-purpose flour
02 - 1/2 cup unsweetened cocoa powder
03 - 1 teaspoon baking soda
04 - 1/2 teaspoon salt
05 - 1 cup granulated sugar
06 - 1/2 cup unsalted butter, softened
07 - 1 large egg
08 - 1 cup buttermilk
09 - 1 teaspoon vanilla extract

→ Marshmallow Filling

10 - 1/2 cup unsalted butter, softened
11 - 1 1/4 cups powdered sugar
12 - 1 jar (7 oz) marshmallow creme
13 - 1 teaspoon vanilla extract
14 - Pinch of salt

# How to Make It:

01 - Preheat the oven to 350°F. Line two baking sheets with parchment paper.
02 - Whisk together the flour, cocoa powder, baking soda, and salt in a medium bowl.
03 - Beat the butter and sugar until light and fluffy, about 2 minutes. Add the egg and beat until combined.
04 - Mix in the buttermilk and vanilla extract. The batter may appear curdled—this is normal.
05 - Gradually add the dry ingredients to the wet ingredients, mixing until just combined.
06 - Drop rounds of batter (about 2 tablespoons each) onto the prepared baking sheets, spacing them about 2 inches apart.
07 - Bake for 10-12 minutes, or until the tops spring back when gently pressed. Cool completely on a wire rack.
08 - Beat the butter until creamy. Add the powdered sugar and beat until smooth. Mix in the marshmallow creme, vanilla, and salt until fully combined and fluffy.
09 - Spread or pipe a generous dollop of filling onto the flat side of half the cookies. Top each with another cookie, flat side down, to create sandwiches.
10 - Serve immediately or store in an airtight container for up to 3 days.

# Expert Tips:

01 -
  • The chocolate cookies stay incredibly soft for days, unlike typical cookies that harden up
  • That marshmallow filling hits the perfect sweet spot between light and indulgent
  • They freeze beautifully so you can surprise yourself with homemade treats later
02 -
  • The batter looking curdled after adding buttermilk is 100% normal—do not try to fix it or add more flour
  • Room temperature ingredients are the difference between dense whoopie pies and ones that taste like cake
  • These cookies continue baking slightly on the hot pan, so remove them when they still look slightly underdone
03 -
  • Set your kitchen timer for 2 minutes less than the recipe says—ovens run hot and these cookies dry out fast
  • If you only have salted butter, reduce the salt in the recipe by half

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