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S’mores Cookie Bars (with sourdough discard)

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Satisfy your craving for s’mores with these easy-to-make s’mores cookie bars! This delicious recipe features the classic combination of marshmallows and chocolate, all baked into a chewy sourdough cookie bar. It is the perfect summer treat without the campfire! 

Three S'mores Cookie Bars stacked on each other

This recipe has layers of graham crackers, chocolate, marshmallow, and my Sourdough Chocolate Chip Cookies recipe. They are the perfect dessert to take to your next family BBQ, or as a summer treat the whole family will love. Every bite is full of gooey marshmallow fluff and melty chocolate, topped with a chewy chocolate chip cookie! And if you love s’mores you also need to try my s’mores sourdough bread.

S'mores Cookie Bar squares on wooden board

Why you should make cookie bars

Cookie bars are a fun twist on a classic cookie! They are an easy way to get layers of flavors without a lot of effort. They are really simple to make inside of a 9×13 pan and you don’t have to worry about taking the time to shape the cookies, you just make one simple layer! 

Tips for making the S’mores Cookie Bars

  • This recipe uses marshmallow cream. The cream is sticky, so when adding the layer use a spatula to spread it out evenly.
  • Use your favorite type of chocolate. I love to use Hershey’s Milk Chocolate bars, but you could also swap it for dark chocolate if you prefer. 
  • Make sure to spray your pan with cooking spray to prevent the bars from sticking. You could also use parchment paper so that when the bars are cooked and ready to cook you can simply pull the parchment paper out of the pan and set the cookie bars on a cutting board to slice. 
Close up on S'mores Cookie Bars on wooden board

Tools to make S’mores Cookie Bar

There are no fancy tools required for this recipe! Just a 9×13 pan and a mixer (stand or hand mixer) to cream the sugar and butter in the cookie batter. This recipe is simple to make and comes together quickly. 

What is sourdough discard?

Sourdough discard is unfed sourdough starter. You can think of it as the leftovers after you feed and use your sourdough starter to make bread and other goodies like sourdough bagels, cinnamon rolls, and more. If you don’t have a sourdough starter you can learn how to make one here. But in the meantime, you can always make this recipe with a favorite chocolate chip cookie dough on top.

Hand holding S'mores Cookie Bar

Ingredients for S’mores Cookie Bars

Bar Layers

  • Graham crackers- I used honey graham crackers but you can use your favorite type. 
  • Butter –Salted or unsalted will work for the base.
  • Chocolate Bars- I use Hershey’s Milk Chocolate bars. You will need 6 full-sized candy bars to fit the 9×13 pan. You can swap for your favorite brand or for dark chocolate if you prefer.
  • Marshmallow creme – The creme bakes up better than marshmallows giving you a gooey marshmallow center.

Cookie dough-

  • Butter – I recommend using unsalted butter so you can control the amount of salt in the recipe.
  • Sugar- This recipe uses a mixture of brown sugar and white sugar for a perfectly moist and chewy cookie.
  • Egg – This will help to bind the dough.
  • Sourdough discard – This adds a slight tang to the flavor and helps makes a moist cookie layer. 
  • Vanilla extract 
  • Baking soda –This will help leaven the cookies.
  • Salt- You can use any type of salt for this. Plus if you want something extra on top sprinkle the top with coarse sea salt.
  • All-purpose flour
  • Chocolate chips – Milk chocolate, semi sweet or dark chocolate all work well depending on your preferences. Or you can go for chocolate chunks.

Instructions on how to make S’mores Cookie Bars

First, preheat your oven to 350F and spray a 9×13 pan with cooking spray to prevent sticking. Or, if you’d like you can line the pan with parchment paper. 

Make cookie dough by creaming together butter and sugars in a large bowl. You can use a stand or hand mixer for this. Next, mix in the egg, sourdough discard, and vanilla. Then mix in dry ingredients, flour, salt, and baking soda, until just incorporated. Stir in chocolate chips. If you would like you could make the cookie dough in advance and refrigerate it for 24-48 hours.

Add graham crackers to the bottom of the 9×13 pan in an even layer. Melt 2 tbsp of butter and then drizzle over the graham crackers to evenly coat them. 

Chocolate layer of Smore's Cookie Bars

Place the chocolate bars over the graham crackers creating the next layer. 

Marshmellow cream layer of Smores Cookie Bars

Cover the bars with marshmallow creme until evenly distributed. Don’t worry about measuring it just use enough to generously cover the surface.

cookie layer of S'mores Cookie Bars

For the last layer, press cookie dough into the top until evenly spread.

Close up on cooked S'mores Cookie Bar

Bake for about 40 minutes, or until cookies are cooked and lightly golden brown.

It will be easiest to cut the cookie bars if you let them cool completely so that they stay together better. Then cut into even squares. To get the melty chocolate again, just pop them in the microwave for a few seconds and enjoy! They are also delicious with a scoop of vanilla ice cream on top. 

How to store the S’mores bars

 To store the S’mores Cookie Bars slice them into squares and then cover them with plastic wrap or in an airtight container. They can be stored on the counter for about a week. To reheat just pop them in the microwave for a few seconds until the chocolate starts to melt. 

More sourdough dessert recipes 

Smore’s Sourdough Bread  Everything you love about S’mores and sourdough bread combined together! This loaf is full of chocolate, marshmallows, and graham crackers. The perfect sourdough bread for the summer! 

Sourdough Chocolate Chip Cookies  This is the best chocolate chip cookie recipe! They are soft, chewy, and every bite is full of melt-in-your-mouth chocolate! 

Easy Sourdough Brownies- This sourdough brownie recipe is better than any boxed brownie mix you can find! They are rich, chocolatey,  moist, and fudgy with the addition of sourdough discard! They are easy to make and only require one bowl!

S'mores sourdough cookie bars cut into squares on top of a wooden board.

S’mores Cookie Bars

Emily Christensen
These S'mores Cookie Bars are everything you love in a s'more but in a cookie bar: gooey marshmallow, warm chocolate and a crisp graham cracker.
5 from 2 votes
Prep Time 15 minutes
Cook Time 40 minutes
Total Time 55 minutes
Course Dessert
Cuisine American
Servings 12 bars
Calories 566 kcal

Ingredients
  

  • 7 rectangle honey graham crackers
  • 28 grams butter, melted 2 Tablespoons
  • 6 Hershey’s Chocolate Bars
  • 208 grams marshmallow fluff 2 cups

Sourdough Cookie Dough

  • 227 grams butter, unsalted 1 cup
  • 220 grams brown sugar 1 cup
  • 150 grams granulated sugar ¾ cup
  • 1 egg 50 grams
  • 75 grams sourdough discard ⅓ cup
  • 13 grams vanilla extract 1 Tablespoon
  • 6 grams baking soda 1 teaspoon
  • 4 grams salt ½ teaspoon
  • 420 grams all-purpose flour 3 cups
  • 252 grams chocolate chips 1 ½ cups

Instructions
 

  • Preheat the oven to 350℉.
  • Make the cookie dough by creaming together the butter and sugars.
    227 grams butter, unsalted, 220 grams brown sugar, 150 grams granulated sugar
  • Beat in egg, vanilla, and sourdough discard until combined.
    1 egg. 13 grams vanilla extract, 75 grams sourdough discard
  • Mix in flour, baking soda, and salt until just incorporated. Add flour slowly adding in enough that the dough does not feel sticky to the touch.
    420 grams all-purpose flour, 6 grams baking soda, 4 grams salt
  • Fold in chocolate chips and any other mix-ins. You can replace some of the chips with sea salt caramel chips or heath bits.
    252 grams chocolate chips
  • Spray a 9×13 pan with non-stick spray.
  • Cover the bottom of the pan with graham crackers.
    7 rectangle honey graham crackers
  • Melt the butter and drizzle overtop.
    28 grams butter, melted
  • Add a layer of chocolate bars.
    6 Hershey’s Chocolate Bars
  • Spread marshmallow fluff on top of the chocolate.
    208 grams marshmallow fluff
  • Dump the cookie dough on top and press into the pan.
  • Make for about 40 minutes or until the cookie is golden brown and cooked through.
  • Let cool and then slice.

Notes

Make sure to spray your pan with cooking spray to prevent the bars from sticking. You could also use parchment paper so that when the bars are cooked and ready to cook you can simply pull the parchment paper out of the pan and set the cookie bars on a cutting board to slice. 

Nutrition

Serving: 1gCalories: 566kcalCarbohydrates: 77gProtein: 5gFat: 27gSaturated Fat: 17gPolyunsaturated Fat: 9gTrans Fat: 1gCholesterol: 66mgSodium: 420mgFiber: 2gSugar: 54g
Keyword chocolate, marshmallow, s’mores, sourdough discard
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One Comment

  1. 5 stars
    This came out great. I made the cookie dough the day before and kept it in the fridge. I used a whole large jar of fluff and used chocolate chips instead of the Hershey layer just cause it’s what I had. Everyone liked it and it was easy to make!

5 from 2 votes (1 rating without comment)

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