S'mores Cookie Bars

5 from 3 votes

S'mores Cookie Bars are a nostalgic dessert that layers graham cracker crust, rich chocolate, and gooey marshmallows atop a buttery cookie base. Skip the classic campfire s'mores and try them in convenient bar form for a fun treat the whole family will love!

Course Dessert

Cuisine American

Keyword s'mores bars, s'mores cookie bars

Prep Time 25

Cook Time 35

Total Time 1

Servings bars

Calories 432kcal

Author Sue Ringsdorf

Ingredients

For the graham cracker crust:

1 cup graham cracker crumbs - crushed in food processor or rolling pin
2 Tablespoons granulated sugar
1/4 cup unsalted butter - melted

Cookie bar - wet ingredients:

3/4 cup unsalted butter - softened to almost room temp
1/2 cup brown sugar (110 grams)
1/2 cup granulated sugar (100 grams)
1 large egg
2 teaspoons vanilla

Cookie bar - dry ingredients:

2 cups all-purpose flour (240 grams)
1 teaspoon baking soda
1/2 teaspoon kosher salt
1 cup chocolate chips
1 ¼ cup mini marshmallows
1.55 oz. milk chocolate bar - Hershey's (one full sized bar)
plus a few more marshmallows for the top

Instructions

Make graham cracker crust:

Preheat oven to 350 degrees.
Use a food processor to crush the graham crackers into course crumbs. Add to a bowl and add melted butter and sugar. Stir to combine.
Press the crumb mixture into a square 8x8 pan lined with parchment paper. Bake for 6 minutes to "set" the crust slightly. It will continue to bake with the cookie layer.
(Save a couple of tablespoons of the crumb mixture for the top of the bars.)
1 cup graham cracker crumbs, 1/4 cup unsalted butter, 2 Tablespoons granulated sugar

Make cookie layer:

Use a large standing mixer (or a hand mixer) to cream together the butter and sugars. Add the egg and vanilla and mix again.
3/4 cup unsalted butter, 1/2 cup brown sugar (110 grams), 1/2 cup granulated sugar (100 grams), 1 large egg, 2 teaspoons vanilla
Add the dry ingredients (flour, baking soda, and salt) to a separate bowl and mix. Then pour into the wet ingredients and mix until just combined. (Don't over-mix.)
2 cups all-purpose flour (240 grams), 1 teaspoon baking soda, 1/2 teaspoon kosher salt
Add the marshmallows and chocolate chips to the bowl and stir with a spatula to combine.
1 ¼ cup mini marshmallows, 1 cup chocolate chips
Use your hands to drop the cookie mixture onto the par-baked crust, carefully so that the crust stays in tact. No need to spread all the way to the corners as the cookies will spread as it bakes!

Bake.

Bake on 350 degrees for 20 minutes, remove pan from oven, add the chocolate bar (in pieces), a few more marshmallows, and a couple tablespoons of reserved graham cracker crumbs. Place back in the oven and bake for another 8-10 minutes.
1.55 oz. milk chocolate bar, plus a few more marshmallows for the top
Remove pan and let the bars sit for 10 minutes. Then use the parchment paper to carefully lift them out of the pan on to a cooling rack. Slice and enjoy!
If you like a firmer bar, feel free to bake for longer. We like them ooey gooey!

Notes

Using a graham cracker crust is worth the extra step. That buttery crust will not go unnoticed! And reserving some crumbs for the tops is 10/10.
Set a timer! When baking the cookie layer, make sure you set a timer so you can remove the pan, add more toppings, and continue baking. This is key to the look, and it's worth it as well.
Don't forget to add parchment paper to the pan. This makes it way easier to pull the bars out of the pan without messing them up. You'll be glad you did!
Bake to your liking. If you like less gooey, bake these for slightly longer. If you like them gooey, follow my directions. :D
Serve with milk or hot chocolate. Depending on the time of year, I suggest you pour either a large glass of milk or a cup of hot cocoa. Super fun!

Nutrition