Best S’mores Bars Recipe – Soft, Chewy and Gooey Chocolate Marshmallow Bars

These s’mores bars are soft, chewy, and packed with melted chocolate and gooey marshmallows. They taste just like classic campfire s’mores, but you do not need a fire or outdoor setup to enjoy them.

This is a simple easy dessert bars recipe made in one pan with basic pantry ingredients. Everything bakes together into sweet layers of graham cracker flavor, rich chocolate, and toasted marshmallow.

These bars are perfect for parties, family desserts, school treats, or weekend baking when you want something quick and comforting.

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Why You Will Love This Recipe

• Easy one-pan dessert with simple steps
• Tastes like real campfire s’mores bars
• Gooey marshmallow and melted chocolate in every bite
• Soft cookie-like base with graham flavor
• Great for make-ahead desserts
• Perfect for holidays, potlucks, and gatherings
• Kid-friendly and crowd-pleasing chocolate marshmallow dessert bars

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Ingredients

• 1 cup butter, melted
• 1 cup brown sugar
• 1/2 cup white sugar
• 2 large eggs
• 1 tsp vanilla extract
• 2 cups all-purpose flour
• 1 cup graham cracker crumbs
• 1 cup chocolate chips
• 2 cups mini marshmallows
• 1/2 tsp baking powder
• 1/4 tsp salt

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Ingredient Notes or Substitutions

• Use dark chocolate chips for a richer flavor
• Milk chocolate or semi-sweet chocolate both work well
• Gluten-free flour can replace all-purpose flour
• Graham crackers can be crushed finely or slightly chunky for texture
• Coconut sugar can replace brown sugar for a deeper caramel taste
• Large marshmallows can be cut into smaller pieces if mini marshmallows are not available
• Add extra chocolate chips for a more fudgy texture

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Step-by-Step Instructions (WPRM Optimized)

Step 1: Prepare the baking pan

Preheat the oven to 350°F (175°C). Line an 8×8 or 9×9 square baking pan with parchment paper. Allow some paper to hang over the edges so you can lift the bars out easily later. Lightly grease the paper to prevent sticking. Set the pan aside.

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Step 2: Mix butter and sugars

In a large mixing bowl, add melted butter, brown sugar, and white sugar. Whisk together until the mixture becomes smooth, thick, and slightly glossy. Make sure there are no dry sugar clumps left. This step helps create a soft and chewy base for the bars.

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Step 3: Add eggs and vanilla

Add the eggs one at a time, mixing well after each addition. Stir in the vanilla extract. The mixture should become creamy and slightly lighter in color. Make sure everything is fully combined so the bars bake evenly.

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Step 4: Add dry ingredients

Add flour, graham cracker crumbs, baking powder, and salt into the wet mixture. Stir slowly until just combined. The dough will be thick and slightly sticky. Do not overmix, as this can make the bars dense instead of soft.

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Step 5: Fold in chocolate chips

Gently fold in chocolate chips using a spatula. Spread them evenly throughout the dough so every bite has chocolate. You can reserve a small handful to sprinkle on top later for extra chocolate layers.

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Step 6: Add first dough layer

Spread about half of the dough into the prepared baking pan. Press it down evenly using a spatula or clean hands. Make sure the base layer reaches all corners, but it does not need to be perfectly smooth.

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Step 7: Add marshmallow layer

Sprinkle mini marshmallows evenly over the dough base. Try to distribute them across the surface so each bite gets gooey marshmallow. Add a few extra chocolate chips on top of the marshmallows if desired for more richness.

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Step 8: Add top dough layer

Take the remaining dough and gently spread it over the marshmallows. This step may feel a little tricky because the dough is thick. Flatten small pieces in your hands and place them across the top, then gently connect them. Some marshmallows may peek through, which is normal and helps create a gooey baked top.

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Step 9: Bake the bars

Bake for 25 to 30 minutes or until the top is golden brown and the edges look set. The center may still look slightly soft, but it will firm up as it cools. Avoid overbaking to keep the marshmallows gooey and soft.

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Step 10: Cool and slice

Remove the pan from the oven and let it cool completely in the pan. This step is important so the bars set properly. Once cooled, lift them out using the parchment paper and cut into squares using a sharp knife. Wipe the knife between cuts for cleaner slices.

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Tips for the Best Results

• Do not overbake or bars will become dry
• Let bars cool fully before cutting for clean slices
• Use parchment paper for easy removal
• Slight underbaking keeps the center extra gooey
• Press dough evenly so layers bake consistently
• Add extra chocolate chips on top for a bakery-style finish

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Variations or Add-ins

• Peanut butter swirl for a nutty flavor
• Crushed Oreos for cookies and cream style bars
• Caramel drizzle after baking for extra sweetness
• White chocolate chips instead of milk chocolate
• Sea salt sprinkled on top for sweet and salty balance
• Nutella layer between dough for extra richness

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What to Serve With It

• Cold glass of milk
• Hot chocolate or coffee
• Vanilla ice cream scoop on warm bars
• Fresh strawberries or raspberries
• Whipped cream topping

These s’mores bars are soft, gooey, and full of chocolate marshmallow goodness. They bring all the flavor of classic campfire s’mores into an easy baked dessert you can make at home anytime.

Perfect for sharing, parties, or simple sweet cravings, this easy dessert bars recipe is one you will want to make again and again.