Sourdough S’mores Cookies with Marshmallows & Brown Butter

These gooey, golden brown sourdough s’mores cookies are one of my favorite wintertime sweet treats!

These sourdough s’mores cookies bring that classic s’mores flavor straight to your kitchen without even trying. The graham cracker dough is perfectly crunchy, and the marshmallows and chocolate give you that melt-in-your-mouth gooeyness. 

It’s like biting into a campfire treat, minus the smoke and sticks. The browned butter adds a rich, nutty flavor, and the sourdough starter gives it a tangy twist that makes these cookies that extra special.

Whether you’re munching after dinner, hanging out with family and friends, or satisfying your sweet tooth, these cookies are sure to hit the spot.

Why You’ll Love This Recipe

A Tasty Twist on a Classic

These sourdough s’mores cookies bring all the flavors you love from campfire s’mores, without needing to gather sticks or light a fire. The graham cracker dough is crunchy, the marshmallows are gooey, and the chocolate, whether you use milk chocolate or dark chocolate chunks, melts perfectly in every bite. It’s like biting into a Hershey’s chocolate bar combined with all the best s’mores flavors, wrapped up in a cookie. It doesn’t get much better than that. 

Brown Butter Makes It Better

Browned butter takes these cookies to a whole new level. It brings this rich, nutty flavor that pairs perfectly with the tangy kick from the sourdough starter. The result? A chewy cookie that’s sweet, savory, and just downright delicious. It’s that secret ingredient you didn’t know you were missing, but now you won’t want to bake without.

Works Great for Any Occasion

I think of them as all-purpose cookies, as they work for almost any time. Whether you’re having a late-night snack, satisfying your sweet tooth, or baking up a batch of cookies to share as meaningful gifts, they never disappoint. 

If you’ve got extra dough, just throw it in a freezer bag and save it for later. The best part? These cookies are super easy to make with simple ingredients, and they’re big, satisfying treats. Just scoop the dough onto the cookie sheet, pop them in the oven, and you’re good to go!.

spend a cozy winter day with me on our homestead making these delicious s’mores cookies!

What You’ll Need

INGREDIENTS

• 1 Cup (2 sticks) butter, browned
• 2 egg yolks
• 3/4 cup sugar
• 3/4 cup brown sugar
• 1 tsp vanilla extract
• 1 tsp salt
• 1 1/2 tsp baking soda
• 3/4 cup sourdough starter (or sourdough discard)
• 2 1/2 cups flour
• 1 1/2 cups (12 oz.) chocolate chips
• 10 oz. mini marshmallows
• 1 cup graham cracker crumbs/pieces

TOOLS

You’re going to need these simple kitchen tools, but hey, no one says you can’t improvise:

• Small saucepan
• Large bowl or stand mixer
• Cookie scooper
• Cookie sheet
• Wire cooling rack
• Plastic wrap or airtight container

Step-By-Step Instructions

If you’ll be baking right away, preheat the oven to 350F and prepare a parchment paper-lined baking sheet.

1. Use a small saucepan to brown the butter on medium heat.  Once the butter is golden brown, remove it from heat and allow it to cool a little bit, then pour it into a large bowl or the bowl of a stand mixer.
2. Add the brown sugar and white sugar to the large bowl with the brown butter and mix.  Adding the sugars to the butter before adding the egg yolks prevents them from scrambling when coming into contact with the hot/warm melted butter.  
3. Once the butter and sugar are combined, add the egg yolks, sourdough starter, and vanilla and mix until combined.
4. Whisk the all-purpose flour, salt, and baking soda together in a separate bowl, and then add the dry ingredients to the large bowl of wet ingredients and mix until just combined.  Do not overmix.  
5. Add the marshmallows, graham cracker pieces, and chocolate chips and stir.
6. Use a cookie scoop or spoon the cookie dough onto prepared baking sheets and bake at 350F until you have crispy edges but the middles are still soft, 8-10 minutes.
7. Cool on a wire cooling rack and serve.

Notes

• For the best results, brown the butter until it is just golden brown with flecks of milk solids appearing at the bottom of the saucepan.  Watch the butter closely to avoid burning it.  This one step goes a long way to achieve that chewy texture that is an essential part of making the perfect cookie.
• Do not overmix.  Overmixing cookie dough can make the sourdough cookies hard and dry rather than soft and chewy.
• Cold-proof the cookie dough in the fridge in an airtight container overnight or for several days for some added sourdough flavor.
• Add a handful of extra marshmallows if you really want the gooey marshmallow effect!
• I used freshly milled einkorn flour for the cookies in the photos, using freshly milled whole wheat flour makes this a much healthier treat and twist on classic s’mores.  

Tips

• For the best results, brown the butter until it is just golden brown with flecks of milk solids appearing at the bottom of the saucepan.  Watch the butter closely to avoid burning it.  This one step goes a long way to achieve that chewy texture that is an essential part of making the perfect cookie.
• Do not overmix.  Overmixing cookie dough can make the sourdough cookies hard and dry rather than soft and chewy.
• Cold-proof the cookie dough in the fridge in an airtight container overnight or for several days for some added sourdough flavor.
• Add a handful of extra marshmallows if you really want the gooey marshmallow effect!
• I used freshly milled einkorn flour for the cookies in the photos, using freshly milled whole wheat flour makes this a much healthier treat and twist on classic s’mores.  

Storage

If you won’t be baking right away, cover the bowl of cookie dough with plastic wrap or store it in an airtight container in the refrigerator for up to 5 days.  Store this sourdough s’mores cookies dough in an airtight container in the freezer for up to 3 months.  Once the cookies are baked, you can store them at room temperature for 3-4 days or freeze them for up to 3 months.

Recipe Like This:

• Homemade Sourdough Pasta Recipe {Easy Egg Noodles}
• Sourdough S’mores Cookies with Marshmallows & Brown Butter
• Delicious Family Recipes for Cozy Fall Cooking
• The Best Homemade Sourdough Croutons – Easy Recipe
• The BEST Kamut Flour Pancakes – Simple Recipe