Name: Gooey Cookie Butter S’mores Blondies Recipe
Prep time: 15 min
Cook time: 30 min
Total time: 2 h 45 min
Cuisine: American
Ingredients: 6 oz unsalted butter, melted; ¾ cup brown sugar; 1 large egg, at room temperature; 2 tsp vanilla extract; 1 ¼ cups all-purpose flour; 1 cup graham cracker crumbs, ground fine; ½ tsp baking soda; ½ tsp salt; 3 large chocolate bars (Cadbury’s Dairy Milk recommended); ½ cup cookie butter (Trader Joe’s or Biscoff spread); 1 7-oz container marshmallow fluff

Jump to Recipe· 4.7 from 9 reviews

If you’re looking for a dessert that hits all the right nostalgic notes while delivering that perfect melt-in-your-mouth experience, you’ve got to try this Gooey Cookie Butter S’mores Blondies Recipe. Imagine rich blondie dough bursting with layers of cookie butter, soft marshmallow fluff, and melty chocolate, all wrapped in the cozy flavors of graham crackers and brown sugar. I promise, once you make this, it’ll become your go-to treat for gatherings or whenever you need a little comforting indulgence.

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Why This Recipe Works

Layered Textures: From the crunchy graham cracker crumbs to the gooey marshmallow fluff, each bite offers delightful contrasts.
Rich Flavors: The cookie butter adds warm, spiced notes that perfectly complement the smooth chocolate and sweet blondie base.
Easy Assembly: No complicated steps or fancy tools—perfect for both beginners and seasoned bakers craving a satisfying treat.
Balanced Sweetness: Brown sugar and marshmallow fluff tune the sweetness just right without overwhelming your palate.

Gooey Cookie Butter S'mores Blondies, cookie butter blondies, s'mores dessert, easy blondie recipes, chewy 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

Every ingredient in this Gooey Cookie Butter S’mores Blondies Recipe plays a special role, coming together to create that luscious, cozy flavor and texture. I always recommend using quality ingredients because they really make a difference – trust me, you’ll taste it!

Gooey Cookie Butter S'mores Blondies, cookie butter blondies, s'mores dessert, easy blondie recipes, chewy 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: Melted butter provides that rich, tender crumb; using unsalted lets you control the saltiness perfectly.
Brown Sugar: Adds moisture and deep caramel flavor which gives these blondies their classic richness.
Egg: Helps bind everything together and adds structure without drying out the batter.
Vanilla Extract: Elevates all the sweet flavors, giving a warm, comforting aroma.
All-Purpose Flour: The backbone that holds these blondies together, but not too much to keep them soft.
Graham Crackers Crumbs: This adds that iconic s’mores crunch and a subtle buttery note.
Baking Soda: Gives a little lift to the blondies, so they’re not too dense.
Salt: Enhances the sweetness and balances the flavors beautifully.
Chocolate Bars (Cadbury’s Dairy Milk recommended): Melted chunks add creamy richness and an irresistible melty layer.
Cookie Butter (Trader Joe’s or Biscoff): The star ingredient that brings in warm spice and smoothness, swirling through the batter and marshmallow.
Marshmallow Fluff: Creates that gooey, sticky s’mores feeling right inside your blondies—pure nostalgia.

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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.

Make It Your Way

I love how versatile this Gooey Cookie Butter S’mores Blondies Recipe is, so I always experiment with little twists depending on my mood or who I’m baking for. Don’t be shy to add your spin — that’s what makes this recipe fun and uniquely yours.

Variation: I’ve swapped regular chocolate bars for dark chocolate or even peanut butter cups to vary the flavor punch—each brings a different, delicious angle.
Dietary Swap: Using gluten-free flour blend works pretty well here; just be mindful it might alter texture slightly but still yum!
Seasonal Touch: Around holidays, I add a pinch of cinnamon or pumpkin spice into the batter for festive vibes.

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

Step 1: Prep Your Pan and Oven

First things first, preheat your oven to 350°F (180°C). Line a 9″x9″ baking pan with parchment paper or aluminum foil, making sure the foil overhangs on the sides. This little extra helps you lift out the blondies cleanly without any falling apart—trust me, it’s a game changer.

Step 2: Mix the Wet Ingredients & Sugar

In a large bowl, whisk your melted butter together with the brown sugar until smooth. Then add in the egg and vanilla extract, mixing until it all comes together. The sugar won’t be fully dissolved yet, and that’s okay—it helps create those slightly chewy edges we all love.

Step 3: Combine Dry Ingredients

In a separate bowl, whisk together the all-purpose flour, finely ground graham cracker crumbs, baking soda, and salt. Gradually fold these dry ingredients into your wet mixture just until you don’t see streaks of flour. Overmixing can make the blondies tough, so be gentle here.

Step 4: Build Your Layers

Press half the batter into your prepared pan, smoothing it evenly. Dollop half the cookie butter on top in about 9 spots. Grab a knife or offset spatula and gently swirl that cookie butter into the batter—it doesn’t have to be perfect, those swirls make it look so homey and inviting! Next, carefully place your broken chocolate bars evenly across the batter.

Spread all of the marshmallow fluff evenly on top of the chocolate layer. Then repeat your cookie butter dollops on top of the fluff and swirl those gently in. The last step is pressing the remaining batter into a disc shape and carefully placing it over the top to cover all those gooey layers below.

Step 5: Bake & Cool

Bake in the oven for 25-30 minutes. You’ll want to keep an eye on it—the edges should be golden and set while the center stays delightfully gooey but not raw. Once out, let it cool completely before slicing; this part’s tough but crucial if you want neat bars that hold together rather than a sticky mess.

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Tips from My Kitchen

Perfect Swirls: Don’t over-mix when swirling the cookie butter; those beautiful pockets are what make each bite exciting.
Marshmallow Magic: Use a spatula to spread marshmallow fluff gently so you don’t disturb the chocolate underneath.
Cooling Patience: Waiting to cool completely feels impossible, but it’s the key to neat slices.
Chocolate Choice: I prefer Cadbury Dairy Milk for its creaminess, but feel free to experiment with your favorites.

How to Serve Gooey Cookie Butter S’mores Blondies Recipe

Gooey Cookie Butter S'mores Blondies, cookie butter blondies, s'mores dessert, easy blondie recipes, chewy 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 like to dust these blondies lightly with powdered sugar for an elegant touch or sprinkle some crushed graham crackers right on top for extra crunch and visual appeal. A small drizzle of melted chocolate or additional cookie butter warmed up is another way I fancy serving them, especially when they’re still a bit warm.

Side Dishes

These blondies are a dessert star, so I usually keep sides simple: a scoop of vanilla ice cream or a dollop of whipped cream pairs beautifully. Hot chocolate or a cold glass of milk round out the cozy s’mores vibe perfectly on cooler evenings.

Creative Ways to Present

For parties, I like to cut these blondies into bite-size squares and arrange them on a rustic wooden board with little jars of cookie butter and marshmallow fluff for extra dipping fun. They make a great handheld treat at summer BBQs or camping trips, too—like campfire s’mores reinvented!

Make Ahead and Storage

Storing Leftovers

I store leftover blondies in an airtight container at room temperature for up to 3 days. If your kitchen is warm, refrigeration helps keep them from getting too soft, but I find this can slightly change the texture, so I usually bring them back to room temp before serving for best results.

Freezing

Yes, you can freeze these blondies! Just wrap them tightly in plastic wrap and then in foil or use freezer-safe containers. I’ve frozen them for up to 2 months with almost zero loss in flavor or texture. Just thaw overnight in the fridge and enjoy the next day.

Reheating

To warm leftovers, I microwave individual blondies in 15-second bursts until soft and gooey again, or pop them in a 300°F oven for 5-7 minutes. This little reheat brings back that freshly baked magic without drying them out.

FAQs

Can I use crunchy cookie butter for this recipe?

You can, but I recommend smooth cookie butter for easier swirling and a more uniform texture. Crunchy versions might create pockets that don’t blend as well, but if you love that nutty crunch, go ahead and give it a try!
What’s the best way to crush graham crackers finely?

I usually place them in a zip-top bag and gently crush with a rolling pin. For extra fine crumbs, you can pulse them briefly in a food processor, but be careful not to turn them into powder.
Can I substitute marshmallow fluff with mini marshmallows?

Mini marshmallows work but will alter the gooey layer slightly since they melt differently. If you try it, add them after baking or halfway through to prevent burning.
How do I know when the blondies are perfectly baked?

Look for set edges that are lightly golden with a soft, slightly jiggly center. They’ll firm up more as they cool, so avoid overbaking to maintain that gooey texture.

Final Thoughts

This Gooey Cookie Butter S’mores Blondies Recipe is one of those treats I come back to time and again because it never disappoints. It captures that fun s’mores spirit with an elevated twist that feels homemade and heartfelt. Whether you’re baking for a crowd or just craving a cozy pick-me-up, give it a whirl—you’ll have everyone asking for seconds, just like my friends do whenever I bring it to our get-togethers!