Soft chocolate cookies topped with marshmallow buttercream and a swirl of melted chocolate. Just like a Hostess cupcake — in cookie form!

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🧾 Ingredients

Chocolate Cookies

• ½ cup (113 g) unsalted butter, softened

• ½ cup (102.5 g) shortening

• 1 cup (200 g) granulated sugar

• 2 large eggs, room temperature

• 1 teaspoon vanilla extract

• 2 cups (250 g) all-purpose flour

• 1 cup (118 g) Dutch-processed cocoa powder

• 2 tablespoons cornstarch

• 1 teaspoon kosher salt

• ½ teaspoon baking powder

Marshmallow Buttercream

• ½ cup (113 g) unsalted butter, softened

• ¼ teaspoon vanilla extract

• Pinch of kosher salt

• 2 cups (250 g) confectioners’ sugar

• ¾ cup (72 g) marshmallow fluff or crème

Chocolate Topping

• ½ cup (91 g) semi-sweet chocolate chips, melted

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👩‍🍳 Instructions

Make the Cookies

1. Preheat oven to 325°F (160°C). Line a baking sheet with parchment paper.

2. In a large bowl or stand mixer, beat together butter, shortening, sugar, eggs, and vanilla until well combined.

3. Add flour, cocoa powder, cornstarch, salt, and baking powder to the mixture and mix until fully incorporated.

4. Scoop ¼ cup of dough per cookie (or combine two 2-tbsp scoops). Place dough on the sheet, 2 inches apart.

5. Flatten each cookie slightly to about ¼–½ inch thick.

6. Bake for 12–14 minutes, depending on desired softness.

7. Let cookies cool completely on a wire rack.

Make the Marshmallow Buttercream

1. Cream butter on medium speed until light and fluffy (about 2 minutes).

2. Mix in vanilla and salt.

3. Gradually add confectioners' sugar, mixing well after each addition. Beat on high speed for 2–3 minutes once combined.

4. Gently fold in marshmallow fluff by hand.

5. Pipe about 2 tablespoons of buttercream on each cooled cookie.

Add the Chocolate Topping

1. Melt chocolate chips in the microwave in 30-second intervals, stirring between each, until smooth.

2. Drizzle melted chocolate over the buttercream in a swirl or zigzag pattern.

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Yield: 10 large cookies

Prep Time: 20 min | Cook Time: 12 min | Total Time: 32 min
Calories (per cookie): ~654 kcal