If you love the nostalgic flavor of classic s’mores but crave something more indulgent than a campfire snack, Chewy S’mores Blondie Bars are about to become your new favorite dessert. These bars combine buttery blondie dough, melty chocolate, toasted marshmallows, and crunchy graham crackers into one thick, bakery-style treat. They’re soft in the center, golden on the edges, and absolutely irresistible.

Unlike brownies, which rely on cocoa powder for their flavor, blondies are all about brown sugar, butter, and vanilla. That caramel-like base is the perfect canvas for s’mores flavors. Every bite of these bars delivers gooey marshmallow pull, pools of melted chocolate, and that unmistakable graham cracker crunch.

Whether you’re baking for a party, a family movie night, a bake sale, or just because your sweet tooth demands it, these chewy s’mores blondie bars hit every note: easy, nostalgic, comforting, and wildly delicious.

Why You’ll Love These S’mores Blondie Bars

• Ultra-chewy center with crispy edges
• Loaded with chocolate and marshmallow
• No campfire required
• Easy one-bowl base batter
• Perfect for make-ahead desserts
• Crowd-pleasing flavor everyone recognizes

They’re like s’mores meets cookie bars meets blondies… and somehow better than all three.

Ingredients

Blondie Base

1 ¾ cups all-purpose flour
½ tsp baking powder
½ tsp salt
½ cup unsalted butter, melted and cooled
1 cup brown sugar, packed
1 large egg + 1 egg yolk
1 tbsp vanilla extract

S’mores Filling

1 ½ cups graham cracker pieces
1 ½ cups semi-sweet chocolate chunks or bars
1 ½ cups mini marshmallows

Instructions

Preheat oven to 350°F (175°C). Line a 9×13-inch baking pan with parchment paper and lightly grease.
In a bowl, whisk together flour, baking powder, and salt. Set aside.
In a large bowl, mix melted butter and brown sugar until glossy and smooth.
Whisk in egg, egg yolk, and vanilla until thick and creamy.
Fold in dry ingredients just until combined — don’t overmix.
Gently fold in graham crackers and chocolate chunks.
Spread batter evenly into prepared pan.
Sprinkle marshmallows evenly over the top, lightly pressing them into the batter.
Bake 25–30 minutes until edges are golden and center is just set.
Cool completely before slicing for perfect chewy bars.

What Makes These Blondies So Chewy?

The secret to chewy blondies is brown sugar + melted butter + egg yolk. Brown sugar adds moisture and caramel notes, melted butter keeps the crumb dense and rich, and the extra yolk adds fat for that soft interior.

No dry, cakey blondies here.

Tips for Perfect S’mores Blondie Bars

• Use chopped chocolate bars instead of chips for better melt
• Press marshmallows halfway into batter so they don’t burn
• Don’t overbake — centers should look slightly underdone
• Cool completely before slicing for clean edges

Variations

• Peanut Butter S’mores Bars – Add peanut butter chips
• Dark Chocolate Lovers – Use 70% cacao chunks
• Salted Caramel S’mores Blondies – Drizzle caramel and sea salt on top
• Nutty Version – Add chopped pecans or walnuts

Serving Suggestions

Serve these bars:
• Warm with vanilla ice cream
• With hot cocoa or coffee
• As a bake-sale star
• On a dessert board with fruit and cookies

Fun Fact: The History of S’mores

S’mores date back to the 1920s and were first printed in the Girl Scouts handbook. The name comes from “some more” — because one is never enough. These blondies honor that legacy by packing all that campfire flavor into a bakery-style bar you can make in your kitchen.

Storage & Freezing

• Store in airtight container up to 4 days
• Refrigerate for firmer texture
• Freeze bars individually wrapped up to 2 months

Final Thoughts

These Chewy S’mores Blondie Bars are everything you want in a dessert: nostalgic, gooey, rich, and easy. They turn classic campfire flavors into a thick, bakery-style treat you can bake year-round. Once you make them, you’ll never look at s’mores the same way again.