Peanut Butter Mallow Cookies

Peanut butter, marshmallow, and chocolate are the ultimate trio, and these Peanut Butter Marshmallow Sandwich Cookies bring them together in the best way possible. Soft peanut butter cookies filled with fluffy marshmallow frosting and dipped in a layer of smooth chocolate—it’s a dessert that’s simple to make and impossible to resist. Whether you’re whipping up a batch for a party or just want to treat yourself, these cookies are fun, delicious, and guaranteed to impress.

Peanut Butter Mallow Cookies

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• Author: Taryn Camp

Ingredients

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Peanut Butter Cookies:

• 1 cup creamy peanut butter
• 1/2 cup unsalted butter, softened
• 1 cup granulated sugar
•  1/2 cup packed brown sugar 
• 1 large egg
• 1 tsp vanilla extract
• 1 1/4 cups all-purpose flour
• 1/2 tsp baking soda
• 1/4 tsp salt

Marshmallow Fluff Frosting:

• 1 cup (2 sticks) salted butter, softened
• 1 jar (7 oz) marshmallow fluff
• 2 cups powdered sugar
• 1 tsp vanilla extract
• Heavy cream (optional, for consistency)

Chocolate Coating:

• 1 bag Ghirardelli milk or dark chocolate melts

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Instructions

1. Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper.
2. In a large bowl, beat the peanut butter, softened butter, granulated sugar, and brown sugar until light and fluffy.
3. Mix in the egg and vanilla extract until fully combined.
4. In a separate bowl, whisk together the flour, baking soda, and salt. Gradually add the dry ingredients to the wet mixture, stirring until a dough forms.
5. Roll the dough into 1 1/2-inch balls and place them on the prepared baking sheet. Flatten slightly with the back of a spoon or your hand.
6. Bake for 10–12 minutes, or until the edges are lightly golden. Cool the cookies completely on a wire rack.
7. In a large bowl, beat the softened butter until light and creamy, about 2–3 minutes.
8. Add the marshmallow fluff and mix until fully combined.
9. Gradually beat in the powdered sugar, one cup at a time, mixing thoroughly between additions.
10. Add the vanilla extract and continue to beat until the frosting is smooth. If needed, add heavy cream 1 tablespoon at a time to adjust the consistency.
11. Spread or pipe a swirl of marshmallow frosting onto the flat side of one cookie. Top with another cookie and press gently to spread the frosting to the edges.
12. Repeat with the remaining cookies and frosting.
13. Melt the chocolate according to the package instructions.
14. Line a cookie sheet with parchment paper. Dip each cookie sandwich halfway into the melted chocolate, letting the excess drip off.
15. Place the dipped cookies on the prepared sheet and allow the chocolate to set at room temperature or in the fridge for faster results.
16. Bring the cookies to room temperature before serving for the best flavor and texture. Store any leftovers in an airtight container.

There’s something just so nostalgic about the combination of peanut butter, marshmallow, and chocolate. These Peanut Butter Marshmallow Sandwich Cookies take that classic trio to a whole new level! Imagine soft, chewy peanut butter cookies filled with a fluffy marshmallow frosting, then dipped in a creamy layer of melted chocolate. They’re totally fun and completely irresistible. These would be perfect for parties, bake sales, or just a fun weeknight treat. 

What makes these cookie sandwiches so special? For starters, they’re incredibly easy to make. The peanut butter cookie base is soft yet sturdy, perfect for holding that sweet marshmallow filling. Speaking of the filling—it’s pure fluff heaven! Made with marshmallow fluff, butter, and a touch of vanilla, it’s creamy, light, and oh-so-satisfying. And let’s not forget the chocolate coating! Dipping each sandwich cookie into melted chocolate adds the perfect finishing touch, balancing the sweetness with a bit of rich decadence. Plus, they look gorgeous  once the chocolate sets, if I do so say myself!

These cookies are also super kid friendly. Get them involved in rolling the cookie dough balls or dipping the sandwiches into chocolate. And don’t be afraid to get creative—sprinkle the chocolate with chopped nuts, colorful sprinkles, or even a pinch of flaky sea salt before it sets. Serve them with a glass of milk or wrap them up to sell as a favor, but either way these Peanut Butter Marshmallow Sandwich Cookies are guaranteed to hit the spot. Happy baking!