If you’ve ever been torn between a gooey brownie, a chewy cookie, and the nostalgia of s’mores, Brookie S’mores Bars are about to become your new obsession. This layered treat starts with a buttery biscuit base, packs in a cookie dough layer loaded with chocolate chips and marshmallows, and is crowned with a fudgy, chocolatey brownie layer topped off with toasted marshmallows. Every bite is a journey: crispy, chewy, melty, and utterly decadent. Whether you’re sharing with friends around a campfire or sneaking a piece straight from the pan, these bars deliver signature s’mores bliss in every irresistible slice.

Brookie S'mores Bars Recipe - Recipe Image

Ingredients You’ll Need

You might be surprised at how straightforward the ingredients list is for Brookie S’mores Bars! Each addition plays an important part, from the digestives that build that classic s’mores crust, to the marshmallows that offer gooey magic. Trust in the process, because each element truly delivers on taste and texture.

Digestive Biscuits or Graham Crackers (1 and 1/2 Cups, 125g, crushed): These bring that campfire s’mores flavor and a perfect crispy base.
Butter (1/3 Cup, 75g, melted for base): Melted butter helps bind the crust together and adds rich flavor.
Butter (1/2 Cup, 110g, partially melted for cookie): Partially melted, it’s easier to cream for a soft, chewy cookie texture.
Brown Sugar (1/3 Cup, 65g): Essential for that chewy, caramelly cookie bite.
Sugar (1/4 Cup, 50g for cookie & 1/2 Cup, 100g for brownie): Adds balanced sweetness to both layers.
Large Eggs (2, divided): One for the cookie dough, one for brownies, both for richness and structure.
Vanilla Extract (1 tsp for cookie, 1/2 tsp for brownie): The secret to making everything taste bakery-fresh.
All Purpose Flour (1 Cup + 2 Tbsp, 135g for cookie & 3/4 Cup, 95g for brownie): The backbone of both the cookie and brownie layers, don’t pack it too tightly.
Baking Powder (1/2 tsp): Just enough to give the cookie layer a light lift.
Chocolate Chips (1/2 Cup, 90g for cookie; 1/3 Cup, 75g for topping): Use a mix of milk and dark for extra dimension.
Marshmallows (5, chopped for cookie layer; 16-20 for topping): Chopped ones melt into gooey pockets, while whole ones toast on top!
Dark Chocolate (1/2 Cup, 100g for brownie): The source of deep, intense brownie flavor—pick one you like to eat on its own.
Butter (1/3 Cup, 75g for brownie): Keeps the brownie layer richly moist.
Cocoa Powder (3 Tbsp, 19g): An extra boost of chocolatey depth in the brownie layer.

How to Make Brookie S’mores Bars

Step 1: Line and Preheat

Begin by lining an 8″x8″ baking pan with parchment or baking paper. This keeps everything from sticking and makes it easy to lift out perfect bars. Preheat your oven to 160°C (325°F) so the layers get that even, gentle bake. Prepare now and you’ll thank yourself later when slicing!

Step 2: Build the S’mores Base

Melt the butter completely and stir it into your crushed digestive biscuits or graham crackers. Press this delicious, sandy mixture firmly into the base of your prepared pan. Pop it into the fridge while you move on—this quick chill helps everything stay together under the next layers.

Step 3: Layer on the Cookie Dough

In a bowl, beat the super soft (almost melted) butter, brown sugar, and sugar together until it’s creamy and light. Add your egg and vanilla extract, mixing well. Stir in the flour, baking powder, and a generous cupful of chocolate chips—think of it as building the most extra cookie, ever. Spread this dough over your chilled base. Then, scatter with the extra 1/3 cup chocolate chips and the chopped marshmallows for bursts of gooey sweetness in every bite.

Step 4: Mix Up the Brownie Batter

Melt the butter with the chopped dark chocolate, stirring until smooth and glossy. Meanwhile, in a separate bowl, whip up the egg, sugar, and vanilla extract until the mixture is pale and fluffy—this little bit of aeration is the ticket to a specially fudgy brownie layer. Fold in your chocolate-butter blend, then sift in the cocoa powder and flour, stirring gently, just until combined.

Step 5: Assemble and Bake the Brookie S’mores Bars

Pour the luscious brownie batter over your cookie dough layer and smooth it out. Slide the pan into the oven for 10 minutes, just enough for the brownie to start setting at the edges.

Step 6: Add Marshmallow Magic

After 10 minutes, carefully take out the pan and evenly dot the top with five marshmallows (or go all out and use up to twenty mini ones). Return to the oven and bake for an additional 10-15 minutes. The marshmallows should be golden on top, the sides of the bars set, and the middle just barely wobbly. Let cool completely for easy slicing, or dig in warm with a spoon for glorious gooeyness.

How to Serve Brookie S’mores Bars

Garnishes

Brookie S’mores Bars are already dazzling, but why not go bigger? A sprinkle of flaky sea salt right when they come out of the oven brings out the chocolate. A mini drizzle of melted chocolate, a dusting of powdered sugar, or even more crushed graham crackers or digestive biscuits on top can make each square pop visually and taste-wise.

Side Dishes

These bars stand proudly on their own, but if you’re hosting, try them alongside scoops of creamy vanilla or chocolate ice cream for a full s’mores sundae effect. For a lighter bite, coffee or a class of cold milk helps cut through the richness and makes each decadent layer shine.

Creative Ways to Present

For a party, cut the Brookie S’mores Bars into cute bite-sized cubes, spear each with a skewer, and serve with a side of warm chocolate sauce for dipping. Or, go rustic and serve big, hearty squares on a wooden board with extra marshmallows scattered around. For a truly playful twist, stack them up like s’mores towers and let guests pick their own toppings!

Make Ahead and Storage

Storing Leftovers

Brookie S’mores Bars store well covered in an airtight container at room temperature for up to three days. If your kitchen runs hot or the marshmallows start to weep a bit, tuck them in the fridge. They’ll keep their chewy texture and chocolate punch, just let them come back to room temperature before serving for the best experience.

Freezing

If you made a big batch or want to save some for a future craving, these freeze beautifully. Layer parchment between slices to keep them from sticking, then seal in a freezer bag or airtight container. They’ll stay delicious for a month—just remember to let them thaw at room temperature before you snack, so the textures can come back to life.

Reheating

Want that gooey, just-baked vibe? Pop individual Brookie S’mores Bars in the microwave for 8-10 seconds—the chocolate and marshmallow will soften up perfectly. If you’re reheating a larger batch, a quick warm-up in a low oven (140°C/285°F) for about 10 minutes works wonders without drying them out.

FAQs

Can I double the recipe for a crowd?

Absolutely! Just double all ingredients and use a 9″x13″ baking pan. The layers will remain thick and luscious; you might need to add a few more minutes to the baking time, so keep a close eye near the end.

What if I only have mini marshmallows?

No problem at all—mini marshmallows work perfectly for the layers and on top. You may want to scatter them generously across the cookie and brownie layers to ensure every bite gets that gooey marshmallow moment.

Can I use a different type of chocolate?

Certainly! While dark chocolate delivers a deep, rich flavor, you can swap in milk chocolate for extra sweetness or even a mix for a more nuanced flavor. Chopped chocolate chunks also create bigger pockets of melty chocolate for true s’mores lovers.

Is it necessary to let the bars cool completely before slicing?

Letting Brookie S’mores Bars cool down makes it much easier to cut clean slices, as the layers firm up and set. If you prefer a warm, messy treat (or can’t wait!), dive in with a spoon while they’re still slightly warm—the messier, the better!

Can I make Brookie S’mores Bars gluten-free?

Absolutely, just use your favorite gluten-free graham crackers or digestive biscuits and swap the all-purpose flour for a trusted 1:1 gluten-free baking blend. The texture may be a touch different, but the s’mores magic will still be there.

Final Thoughts

These Brookie S’mores Bars are everything you want from a fireside favorite and a homemade cookie-brownie mashup, all in one glorious pan. Trust me, once you try these once, they’ll be in the permanent treat rotation. Gather your ingredients, share them with friends, and get ready for a sweet adventure with every bite. Enjoy every gooey, chocolatey morsel!