Name: Gooey Cookie Butter S’mores Blondies Recipe
Prep time: 30 min
Cook time: 30 min
Total time: 3 h
Cuisine: American
Ingredients: 6 oz Unsalted Butter, melted; 150 grams Brown Sugar (¾ cup); 1 Large Egg, at room temperature; 2 tsp Vanilla Extract; 156 grams All-Purpose Flour (1 ¼ cup); 100 grams Graham Crackers Crumbs, ground fine (1 cup); ½ tsp Baking Soda; ½ tsp Salt; 3 Large Chocolate Bars (preferably Cadbury’s Dairy Milk); 4 oz Cookie Butter (Trader Joe’s or Biscoff Spread, ½ cup); 1 – 7 oz Container Marshmallow Fluff

Jump to Recipe· 4.5 from 36 reviews

If you’re anything like me and have a serious sweet tooth, wait till you try this Gooey Cookie Butter S’mores Blondies Recipe. It’s like all your favorite nostalgic flavors got together and threw a party in one pan — smooth cookie butter, melty chocolate, and fluffy marshmallow fluff, all baked into a golden, buttery blondie that’s soft and utterly divine. Trust me, once you make these, they’ll be your go-to treat whenever you want a little comfort dessert with a fun twist.

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Why This Recipe Works

Perfect Texture Balance: The blondies are chewy with gooey pockets thanks to marshmallow fluff and swirls of cookie butter.
Layered Flavors: Combining graham cracker crumbs and melted chocolate bars gives a rich s’mores vibe without the campfire hassle.
Simple Ingredients: Everything’s straightforward but uniquely combined to elevate a classic blondie.
Visual Appeal: The swirls of cookie butter and marshmallow fluff on top make each blondie look as irresistible as it tastes.

Gooey Cookie Butter S'mores Blondies, cookie butter blondies, s'mores dessert recipes, easy blondie recipes, chocolate marshmallow blondies - A close-up top view of a rectangular white tray lined with shiny silver foil, filled with a thick layer of light brown mixture that looks wet and unevenly spread, with bubbles and small lumps visible across the surface, giving it a textured look. The tray is placed on a white marbled surface, with a cracked eggshell piece partially visible near the top right corner. The photo taken with an iphone --ar 2:3 --v 7

Ingredients & Why They Work

This Gooey Cookie Butter S’mores Blondies Recipe uses ingredients that play off one another perfectly—rich butter and brown sugar give cozy sweetness, and the combo of graham crumbs plus cookie butter really nails that s’mores flavor without lighting a fire. Here’s a closer look at each key ingredient:

Gooey Cookie Butter S'mores Blondies, cookie butter blondies, s'mores dessert recipes, easy blondie recipes, chocolate marshmallow blondies - Flat lay of a small white ceramic bowl of melted unsalted butter, a few heaping tablespoons of brown sugar loosely piled on a white ceramic plate, one large whole egg with a clean shell, a small white ceramic bowl of clear vanilla extract, a small white ceramic bowl filled with all-purpose flour, a small white ceramic bowl with finely ground graham cracker crumbs, a pinch of salt and baking soda arranged as small white ceramic bowls of fine white powders, three unwrapped large rectangular milk chocolate bars broken into pieces, a small white ceramic bowl with creamy cookie butter, and a small white ceramic bowl of fluffy white marshmallow fluff, all arranged in perfect symmetry and balanced proportions, placed on a clean white marble surface, soft natural light, photo taken with an iPhone, professional food photography style, fresh ingredients, white ceramic bowls, no bottles, no duplicates, no utensils, no packaging --ar 2:3 --v 7 --p m7354615311229779997

Unsalted Butter: Melting it brings out a more intense buttery flavor and helps the blondies stay ultra moist.
Brown Sugar: Adds deep caramel notes and keeps the texture chewy, which is essential for these blondies.
Egg: Binds everything together and adds structure.
Vanilla Extract: A splash elevates all the flavors beautifully.
All-Purpose Flour: The base that holds these blondies together just right without being cakey.
Graham Cracker Crumbs: Finely ground, these add that familiar crunchy, slightly sweet flavor typical of s’mores.
Baking Soda: Helps with a light rise and slight tenderness.
Salt: Balances out the sweetness and enhances flavor depth.
Chocolate Bars: I love Cadbury Dairy Milk for it’s creamy melt; breaks up perfectly for even chocolate coverage.
Cookie Butter: The star ingredient—its warm cinnamon-spiced flavor swirls add an unexpected twist to traditional blondies.
Marshmallow Fluff: Creates those gooey, chewy spots throughout, mimicking campfire s’mores goodness.

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Note: You’ll find the complete list of ingredients, along with their exact measurements, in the printable recipe card at the bottom of this post.

Tweak to Your Taste

One of the things I adore about this Gooey Cookie Butter S’mores Blondies Recipe is how flexible it is. Whether you’re craving an extra punch of chocolate or want to lighten it up just a tad, you can easily adjust it. I often play around with the toppings or swap chocolates depending on what’s in the pantry. Feel free to make this recipe truly yours!

Add Nuts: I love tossing in chopped pecans or walnuts for a little crunch contrast—try it if you want texture variation.
Vegan/Dairy-Free: Substitute the butter with coconut oil or vegan margarine and use dairy-free chocolate to make it friendly for plant-based diets.
Spicy Twist: Sometimes a pinch of cayenne in the batter amps up the chocolate flavor delightfully.
Seasonal Flavors: Swirl in some pumpkin puree plus cinnamon if you’re feeling autumn vibes instead of cookie butter.

Step-by-Step: How I Make Gooey Cookie Butter S’mores Blondies Recipe

Step 1: Prep the Pan and Ingredients

Preheat your oven to 350°F (180°C). Line a 9″x9″ square baking pan with parchment paper or aluminum foil, leaving a bit of overhang on the sides. This makes lifting out the blondies a breeze once they’re cooled—trust me, you’ll thank yourself later! Also, gather all your ingredients so you can move through the steps smoothly without scrambling.

Step 2: Mix Your Batter

In a large bowl, whisk together the melted butter and brown sugar until smooth and glossy. Next, add the egg (room temperature eggs mix better, so plan ahead) and vanilla extract—whisk again until incorporated. Now stir in your flour, graham cracker crumbs, baking soda, and salt. Mix this just until the dry ingredients disappear; overmixing can make blondies tough. The batter will be thick but spreadable—perfect for pressing into the pan.

Step 3: Layering the Magic

Press half of the batter evenly into the prepared pan. Now, take about half of your cookie butter and drop it into 9 dollops scattered across the batter. Use a knife to gently swirl the cookie butter through the batter in pretty little marbled patterns—it’s fun and sets the stage for that luscious flavor. Next, break your chocolate bars into pieces and spread them evenly over the cookie butter swirl layer. Don’t be shy about filling in all the nooks and crannies; each bite should have some melty chocolate.

Step 4: Top with Marshmallow Fluff and More Swirling

Spread all the marshmallow fluff evenly over the chocolate layer—it’s okay if it’s a little thick. Then dollop the remaining cookie butter sparingly on top and swirl it into the marshmallows a bit. This contrast between marshmallow and spicy-sweet cookie butter is what takes these blondies over the edge. For the final touch, take the rest of the batter and gently press it between your hands into a disc, then lay it carefully over everything to cover the marshmallow layer. This keeps the marshmallow from puffing out too much and keeps the layers distinct yet gooey.

Step 5: Bake and Cool

Bake in your preheated oven for 25-30 minutes. The top should be golden and set, but give a gentle press at the center—it should feel slightly springy, not liquidy. Resist the urge to dig in right away! Let these blondies cool completely in the pan; I like to chill them a bit for cleaner slices. The cooling lets all those gooey layers firm up just enough while keeping the inside soft and melty.

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Pro Tips for Making Gooey Cookie Butter S’mores Blondies Recipe

Use Room Temperature Eggs: They blend better into the batter, making your blondies smoother and preventing curdling.
Don’t Overmix the Batter: Mix until just combined—overdoing it can make your blondies dense instead of tender.
Swirl Gently: Be delicate when swirling cookie butter and marshmallow so your layers stay marbled rather than completely blended.
Cool Fully Before Cutting: Patience is key! Gooey blondies can fall apart if cut too early, so wait until completely cool for neat squares.

How to Serve Gooey Cookie Butter S’mores Blondies Recipe

Gooey Cookie Butter S'mores Blondies, cookie butter blondies, s'mores dessert recipes, easy blondie recipes, chocolate marshmallow blondies - The image shows a close-up of a stack of three dessert bars. Each bar has three visible layers: a bottom cookie dough layer that is light brown and slightly crumbly, a middle layer with melted dark chocolate that looks thick and smooth, and a top layer of marshmallow which is white and fluffy with patches of light golden brown cookie dough spread unevenly on top. The bars are stacked on a white marbled surface with a blurred background. The drawing captures the soft and chewy texture of each layer. Photo taken with an iphone --ar 2:3 --v 7

Garnishes

I usually sprinkle a little flaky sea salt on top just before serving—it brightens the sweetness and adds a lovely crunch. Sometimes, I add a dusting of powdered sugar or even a light drizzle of melted chocolate for a fancy touch when guests come over.

Side Dishes

These blondies are a star themselves, but I like pairing them with a scoop of vanilla ice cream or a simple cup of hot coffee or milk. If it’s chilly out, a mug of hot cocoa feels like the perfect campfire complement without the campfire.

Creative Ways to Present

For parties, I sometimes cut them into smaller, bite-sized squares and serve on a cute platter with mini skewers—almost like mini s’mores bites. Wrapping a few in parchment and tying with twine also makes a lovely gift for friends and neighbors.

Make Ahead and Storage

Storing Leftovers

Store any leftovers in an airtight container at room temperature for up to 3 days. If your kitchen is warm, I recommend refrigerating as the marshmallow can get a bit sticky. Bring back to room temp before serving for best texture.

Freezing

I’ve frozen these blondies wrapped tightly in foil and then placed in a freezer bag with great success. Just thaw overnight in the fridge and they taste just as fresh and gooey as day one.

Reheating

For that warm, melty indulgence, I gently microwave individual blondie squares for 10-15 seconds. The marshmallow fluff gets gooey again, but be careful not to overheat or you’ll melt the cookie butter too much and lose those delicate swirls.

FAQs

Can I use crunchy cookie butter instead of smooth for this recipe?

You can, but smooth cookie butter swirls more evenly through the batter and marshmallow fluff. Crunchy will add texture but might not create that classic marbling effect as easily.
Is there a substitute for marshmallow fluff?

If you can’t find marshmallow fluff, you could try mini marshmallows spread evenly on top, but the texture will be slightly different—fluff creates a smooth, gooey layer, while mini marshmallows melt unevenly and can brown quickly.
How do I make sure my blondies don’t turn out cakey?

Don’t overmix the batter, and don’t overbake them. Pull them from the oven when the edges are set but the center is still a touch soft. Cooling solidifies the center without turning them dry or cakey.
Can I substitute the graham cracker crumbs for something else?

You can try digestive biscuit crumbs or even finely crushed vanilla wafers. Just make sure they’re finely ground so they blend well without changing the texture significantly.

Final Thoughts

Making this Gooey Cookie Butter S’mores Blondies Recipe always cheers me up, especially on gloomy days or when friends pop by unexpectedly. It’s easy enough to whip up but feels special with all its layers and textures working together. I hope you give it a try and delight in that perfect balance of gooey, sweet, and buttery goodness. Seriously, once you taste it, you’ll want to keep this recipe handy for any time you need a sweet hug from the oven!