Peanut Butter Marshmallow Cookies

In the world of homemade treats, few things bring as much joy as a perfectly baked cookie. But not just any cookie. We’re talking about a cookie that combines the rich, salty-sweet flavor of peanut butter with the gooey, irresistible charm of toasted marshmallow, all wrapped up in a soft and chewy golden-brown package.

These Peanut Butter Marshmallow Cookies are that dessert. They’re a unique twist on classic favorites, delivering a playful texture and flavor that makes them a guaranteed hit for any occasion, from after-school snacks to your next potluck dessert table.

This recipe is designed for bakers of all levels, requiring no special equipment or hard-to-find ingredients. The secret to their perfect texture lies in the careful balance of ingredients and a crucial chilling step that prevents excessive spreading.

The result is a large, bakery-style cookie with a slightly crisp edge, a supremely soft center, and delightful pockets of melted chocolate and marshmallow. Let’s dive in and create a batch of these unforgettable treats.

Why You’ll Love This Recipe

These cookies stand out in a crowded field for several compelling reasons. First, the flavor profile is a masterclass in balance. The creamy peanut butter provides a savory, nutty base that perfectly offsets the sweetness of the brown sugar and mini marshmallows.

The vanilla extract deepens the overall flavor, while the mini chocolate chips add bursts of classic, melty chocolate.

Second, the texture is nothing short of magical. The careful creaming of butter and sugars creates a light, almost cake-like crumb, while the marshmallows toast slightly in the oven, creating chewy, sticky pockets. The edges develop a gentle crispness, protecting a center that stays remarkably soft and tender for days if stored correctly.

Finally, this recipe is incredibly reliable. By chilling the dough, you ensure the cookies hold their domed shape and bake up thick, not thin and flat. It’s a simple step with a huge payoff.

Ingredients and Essential Tools

Gathering your mise en place (everything in its place) is the first step to baking success. Here’s what you need for these peanut butter marshmallow cookies.

The Ingredient List

• Unsalted Butter (10 tablespoons, room temperature): Using room-temperature butter is non-negotiable for proper creaming. It should be soft to the touch but not melted.
• Creamy Peanut Butter (⅓ cup): Use a standard, processed creamy peanut butter for the best consistency and flavor. Natural peanut butter (the kind that separates) can alter the texture and spread of the cookies.
• Granulated Sugar (¼ cup) & Light or Dark Brown Sugar (⅔ cup, packed): This duo is key. Granulated sugar promotes spread and crispness, while the molasses in brown sugar delivers moisture, chewiness, and that classic caramel-like flavor.
• Large Egg (1, room temperature): Another room-temperature ingredient! A cold egg can cause the creamed butter and sugar to seize up.
• Pure Vanilla Extract (2 teaspoons): Use the real stuff for the best flavor. It enhances all the other ingredients.
• All-Purpose Flour (1 1/2 cups): The structure-builder of the cookie. Be sure to measure it correctly using the spoon-and-level method to avoid dense cookies.
• Baking Soda (3/4 teaspoon): Our leavening agent, which helps the cookies rise and become tender.
• Salt (1/2 teaspoon): Crucial for balancing the sweetness and making the flavors pop.
• Mini Chocolate Chips (3/4 cup): The “mini” size distributes more evenly throughout the dough, ensuring chocolate in every bite.
• Mini Marshmallows (1/2 cup): These are the star of the show! Mini marshmallows are ideal as they integrate well without creating huge, unstable pockets. They toast and melt slightly inside the cookie.

Tools You’ll Need

You don’t need professional gear. A handheld electric mixer or a stand mixer makes creaming easy. You’ll also need a set of mixing bowls, a whisk, a spatula, a baking sheet (or two), parchment paper, and a cookie scoop (about 1.

5-2 tablespoons in size) for uniform cookies. An oven thermometer is a great tool to ensure your oven is at the correct 350°F.

Step-by-Step Baking Instructions

Follow these steps closely for perfect cookies every time. The total hands-on time is minimal, but patience during the chilling phase is rewarded.

Step 1: Combine Dry Ingredients

In a medium bowl, whisk together the all-purpose flour, baking soda, and salt. Whisking aerates the flour and ensures the leavening and salt are evenly distributed, preventing bitter or dense spots in your finished cookies. Set this bowl aside.

Step 2: Cream Wet Ingredients and Sugars

In the bowl of your mixer fitted with the paddle attachment, combine the room-temperature butter, creamy peanut butter, packed brown sugar, and granulated sugar. Beat on medium speed for a full 2 minutes. The mixture should become light in color, fluffy, and perfectly creamy. This step incorporates air, which is essential for texture.

Step 3: Add Egg and Vanilla

Scrape down the sides of the bowl with a spatula. Add the room-temperature egg and the vanilla extract. Beat on medium speed until fully combined, about 30-45 seconds. Scrape down the bowl again to ensure everything is homogeneous.

Step 4: Incorporate Dry Ingredients

With the mixer on its lowest speed, gradually add the dry ingredient mixture. Mix just until the flour disappears. Do not overmix at this stage, as it can develop the gluten in the flour and lead to tough cookies.

Step 5: Fold in Chips and Marshmallows

Switch to a sturdy spatula or wooden spoon. Add the mini chocolate chips and mini marshmallows to the dough. Gently fold them in until they are evenly distributed. The dough will be thick and slightly sticky.

Step 6: Chill the Dough

This is the most important step for texture and shape. Using your cookie scoop, portion the dough into domed balls (about 6 per batch). Place them on a plate or small baking sheet, cover with plastic wrap, and refrigerate for at least 1 hour.

Chilling solidifies the fat, preventing the cookies from spreading too quickly and turning into thin puddles in the oven. It also allows the flavors to meld.

Step 7: Bake to Perfection

Preheat your oven to 350°F (175°C). Line two baking sheets with parchment paper. Place 6 chilled dough balls on a sheet, spacing them at least 2-3 inches apart as they will spread. Bake one sheet at a time in the center of the oven for 12-14 minutes.

The cookies are done when the edges are set and light golden brown. The centers will look soft and slightly underdone—this is correct! They will set as they cool.

Step 8: Cool Completely

Remove the baking sheet from the oven and let the cookies cool directly on the sheet for at least 10-15 minutes. This allows them to finish setting. Then, you can transfer them to a wire rack to cool completely. The marshmallows will be soft and gooey at first but will set up as they cool.

Expert Tips and FAQ

Can I use natural peanut butter? It’s not recommended for this recipe. The oil separation can make the dough greasy and cause inconsistent results. Stick with a stabilized creamy peanut butter like Jif or Skippy.

My cookies spread too much! The likely culprits are: dough not chilled long enough, butter too warm/soft, or an oven that runs cool. Ensure you chill for the full hour and verify your oven temperature with a thermometer.

Can I freeze the cookie dough? Absolutely! Scoop the dough balls, freeze them on a sheet until solid, then transfer to a freezer bag. Bake directly from frozen, adding 1-2 minutes to the bake time.

Storage: Store completely cooled cookies in an airtight container at room temperature for up to 4 days. For longer storage, freeze baked cookies for up to 3 months.

Nutritional Information

While these are a treat, it’s helpful to know what you’re enjoying. This nutritional data is per cookie, based on a yield of 12 large cookies. For a balanced meal plan, consider pairing a sweet treat like this with a savory main, like our hearty One-Pan Honey Garlic Kielbasa and Veggies.

Nutrient	Amount per Serving
Calories	316 kcal
Total Fat	16 g
Carbohydrates	39 g
Fiber	1 g
Sugar	25 g
Protein	4 g
Sodium	216 mg

More Delicious Recipes to Try

If you love the combination of sweet, savory, and comforting flavors, you’ll adore exploring other dishes on our site. For a creamy, cheesy dinner that’s always a crowd-pleaser, you must try our Creamy Queso Chicken Enchiladas.

And for a fun, family-friendly breakfast or brunch idea that’s as delicious as it is creative, don’t miss our recipe for Pancake Tacos—they’re a guaranteed hit with kids and adults alike.

Baking these Peanut Butter Marshmallow Cookies is more than just following a recipe; it’s about creating a moment of homemade happiness. The aroma that fills your kitchen, the joy of sharing a warm cookie, and the satisfaction of mastering a delicious dessert are all part of the experience.

So preheat your oven, gather your ingredients, and get ready to bake a batch of what might just become your new favorite cookie. Happy baking!

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The Recipe

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