S'mores Cookie Bars

Gooey marshmallow, melty chocolate, and a graham cracker cookie base

If you love s’mores, these cookie bars are about to be your new favorite dessert. They’ve got everything—soft cookie layers, crunchy graham crackers, melted chocolate, and gooey marshmallow fluff baked right in.

They come out golden on top, perfectly gooey in the center, and taste just like a campfire s’more… without the fire.

✨ Why You’ll Love This Recipe

• Easy, one-pan dessert

• Gooey marshmallow center

• Perfect mix of soft + crunchy

• Tastes just like classic s’mores

Ingredients

• 1/2 cup (113 g) butter, softened

• 3/4 cup (150 g) dark brown sugar

• 1 teaspoon (5 ml) vanilla extract

• 1 large egg, room temperature

• 1 cup (125 g) all-purpose flour

• 1/2 teaspoon (2 g) baking powder

• 1/4 teaspoon (1–2 g) salt

• 5 graham cracker sheets, crumbled

• 1 cup semi-sweet chocolate divided

• 1 cup (240 g) marshmallow fluff, divided

👩‍🍳 Instructions

1. Prep the Pan

Preheat oven to 350°F (175°C).Line a 9x9-inch pan with parchment paper for easy removal.

2. Make the Cookie Dough

In a large bowl, cream together softened butter and brown sugar using a hand mixer for about 2–3 minutes until light and fluffy.

Add the egg and vanilla extract, mixing until smooth and fully combined.

3. Add Dry Ingredients

Mix in flour, baking powder, and salt until just combined.

Gently fold in the crumbled graham crackers and 1/2 semi-sweet chocolate.

4. Layer the Bars

Press about 2/3 of the cookie dough evenly into the bottom of the prepared pan. Use a buttered spoon or lightly greased hands to help spread it evenly.

Spread the marshmallow fluff over the base layer.

Take the remaining cookie dough and place it on top, gently flattening it to cover most of the marshmallow layer. Then add rest of semi-sweet chocolate and slightly press down.

5. Bake

Bake for 25–30 minutes, or until the top is golden brown and set.

The marshmallow may puff up and brown—this is exactly what you want and gives that classic s’mores flavor.

Cool & Serve

Let the bars cool slightly before slicing (if you can wait 😅).

Serve warm for extra gooey goodness or let them fully set for cleaner slices.

Tips for Best Results

• Butter your hands when spreading dough—it makes it way easier

• Don’t overbake—centers should stay soft and gooey

• Add extra chocolate on top for a more indulgent finish

• Let cool slightly so bars hold their shape

Final Thoughts

These s’mores cookie bars are gooey, chocolatey, and everything you love about a classic s’more baked into an easy dessert bar. Perfect for sharing… or not 😏