A LITTLE INSPIRATION · SOMETHING DELICIOUS · EVERY DAY

Sourdough S’mores Cookies with Marshmallows and Brown Butter

EVERYDAY TABLE  ·  Nov 6, 2026
Jump to recipe ↓
  • 0 Facebook
  • 575 Pinterest
  • 0 Email
  • Copy Link
  • 575 shares

I love how my Sourdough S’mores Cookies bring together ease of preparation with the irresistible flavors of brown butter and marshmallows, making them an instantly enticing treat.

I stumbled upon the idea for my Sourdough S’mores Cookies on a warm summer evening, as I was reminiscing about childhood camping trips. The crackling fire and gooey marshmallows were unforgettable. It was then I realized that incorporating sourdough discard into a recipe could elevate a classic, creating an exciting fusion of rustic sourdough and nostalgic s’mores flavors.

Sourdough S’mores Cookies with Marshmallows and Brown Butter 2

This recipe feels like a little piece of edible magic, merging my love for artisanal baking with the simple joy of a campfire dessert. It’s special because it uses common pantry ingredients and sourdough discard, making it both budget-friendly and waste-conscious. Plus, its unique flavor profile offers an enticing twist for anyone keen on exploring new culinary experiences without spending hours in the kitchen.

Why You’ll Love Sourdough S’mores Cookies?

  • Simplicity: This recipe is designed for ease. With straightforward steps and common ingredients, it’s accessible to novice bakers and seasoned pros alike.
  • Rich Flavors: The combination of brown butter and sourdough gives these cookies a deep, nutty flavor that stands out, while the marshmallows add a delightful sweetness and chewiness.
  • Unique Texture: The interplay of crispy edges and a soft center creates a satisfying bite, enhanced by the melty marshmallow stretches.
  • Trusted Techniques: By using expert techniques like browning butter and leveraging sourdough’s natural fermentation, these cookies achieve consistent, delicious results every time.
Sourdough S’mores Cookies with Marshmallows and Brown Butter 3

Ingredients Notes

  • All-purpose flour: Provides structure to the cookies. I’ve found high-protein flour yields a chewier texture that’s delightful.
  • Baking powder: Helps with leavening, giving the cookies a slight rise. Freshness is key; always check the expiration date.
  • Baking soda: Works alongside baking powder. It’s essential for the cookies’ spread and browning – a pinch goes a long way.
  • Salt: Balances sweetness and enhances flavor. Opt for fine sea salt for even distribution throughout the dough.
  • Salted butter: Adds rich, nutty notes. Brown it slightly for a toasty flavor that beautifully complements the marshmallows.
  • Sugar or brown sugar: For sweetness and moisture. Brown sugar adds a hint of caramel flavor, pairing well with graham crackers.
  • Sourdough starter: Brings a subtle tang and unique depth. Use it fed and bubbly for the best flavor integration.
  • Vanilla extract: Elevates aroma and flavor. Always opt for pure vanilla extract for authentic taste.
  • Mini chocolate chips: Ensures chocolate in every bite. I prefer semi-sweet for its balance between sweet and bitter.
  • Dark chocolate chunks: For intense cocoa flavor. Choose high-quality chocolate that’s at least 70% cocoa for richness.
  • Crushed graham crackers: Adds crunch and distinct s’more taste. Go for freshly crushed, as pre-crushed often lacks freshness.
  • Mini marshmallows: Create gooey pockets. Larger marshmallows can be cut up for a more traditional s’more texture.

How to Make Sourdough S’mores Cookies?

Sourdough S’mores Cookies with Marshmallows and Brown Butter 4
  • Mise en Place: Start by gathering all your ingredients. Ensure your butter is at room temperature and your eggs are fresh. This brings flavors together more effectively.
  • Brown the Butter: In a saucepan over medium heat, melt and brown the butter until it releases a nutty aroma and turns amber. Allow it to cool slightly.
  • Mix the Wet Ingredients: In a large bowl, blend the sourdough starter with brown sugar and granulated sugar. Mix until smooth, displaying a creamy texture. Add the cooled brown butter and mix again.
  • Blend in the Eggs: Crack the eggs one by one into the mixture, stirring well after each addition until the texture becomes glossy.
  • Dry Ingredients: Sift flour, baking soda, and a pinch of salt together before slowly incorporating it into the wet ingredients. Fold until the dough holds a soft, pliable texture.
  • Incorporate the Marshmallows and Chocolate: Gently fold in marshmallows and chocolate chunks. Ensure an even distribution for a balanced flavor in every bite.
  • Cooling the Dough: Chill the dough in the refrigerator for at least 30 minutes to allow flavors to meld, enhancing the cookie’s chewiness.
  • Bake: Preheat the oven to 350°F (175°C). Scoop dough onto a baking sheet, ensuring an even surface, and bake for 10-12 minutes until the edges turn golden brown.
  • Cooling: Let cookies cool on the baking sheet briefly before transferring to a wire rack to set completely, offering the perfect balance between crispy edges and a soft center.

Expert Cooking Tips

  • I use a digital scale to measure ingredients for accuracy and best texture results.
  • Cooling browned butter slightly prevents it from cooking the eggs when mixing.
  • Chill the dough to prevent excessive spreading during baking.
  • Don’t skimp on the marshmallows—creates gooey interiors as they melt.
  • I always taste my brown butter. Its nuttiness adds that unique flavor.
  • For crisp edges, ensure cookies are of even size before baking.
  • Rotate baking sheets halfway through for even baking.
  • Adjust baking time based on cookie size for perfect results.
  • Silicone mats help achieve even browning without sticking.
  • I allow cookies to cool completely for full flavor development.

Storage Tips

  • Store cooled cookies in an airtight container to maintain freshness for up to 5 days.
  • I layer parchment paper between cookies to avoid sticking.
  • Freeze individually-wrapped cookies to prevent freezer burn.
  • Thaw frozen cookies at room temp to regain their soft texture.
  • Reheat in the oven at 300°F for 5 minutes for a freshly baked feel.
  • Ensure cookies are fully cooled before storing to prevent condensation.
  • Use resealable freezer bags for small batches—saves space and maintains quality.
  • Reheat from frozen on low heat to prevent burning and retain aroma.
  • Check for mold as a sign of expired storage conditions.
  • Always label and date any stored cookies for freshness tracking.

Variations and Substitutions

  • Dairy-Free: Replace butter with coconut oil or a dairy-free margarine to achieve similar richness and texture.
  • Gluten-Free: Use a 1:1 gluten-free baking flour mix without compromising the chewy and crunchy cookie texture.
  • Nutty Twist: Add chopped almonds or walnuts for a delightful crunch and a natural richness.
  • Fruity Flavor: Mix in freeze-dried raspberries for tartness that complements the sweetness of the chocolate and marshmallows.
  • Extra Chocolatey: Swap some flour for cocoa powder to deepen the chocolate flavor without losing cookie structure.
  • Vegan Alternative: Substitute eggs with a flaxseed meal and water mixture to maintain cookie integrity.
Sourdough S’mores Cookies with Marshmallows and Brown Butter 5

What to Serve with Sourdough S’mores Cookies?

  • Vanilla Ice Cream: Creaminess contrasts with the cookie’s chewy texture, enhancing each bite’s flavor complexity.
  • Fruit Salad: Offers a refreshing and light complement, balancing the cookie’s sweetness with natural fruity flavors.
  • Mint Garnish: Adds a fresh scent and taste, enhancing the overall flavor profile of the cookies.
  • Hot Cocoa: A warm drink that pairs well with indulgent cookies, reinforcing the comforting s’mores concept.
  • Roasted Nuts: Provides extra crunch and umami notes, complementing the cookie’s sweet and earthy flavors.

FAQ

Ensure cookies cool completely on a wire rack.

Reduce sugar slightly, maintaining the right balance without compromising taste.

Store in an airtight container for up to a week.

Yes, freeze dough balls and bake directly from frozen.

It enhances flavor and adds a unique tang for depth.

  • 0 Facebook
  • 575 Pinterest
  • 0 Email
  • Copy Link
  • 575 shares
THE RECIPE

Sourdough S’mores Cookies with Marshmallows and Brown Butter

Prep20 min Cook15 min Total time35 min Yield24, 24 cookies

Ingredients

Instructions

  1. Mise en place

    Gather all ingredients. Ensure butter is at room temperature and eggs are fresh for maximum flavor.

  2. Brown the butter

    Melt butter over medium heat until it’s nutty and amber, then cool slightly.

  3. Mix wet ingredients

    In a bowl, blend sourdough starter with sugars until smooth. Add brown butter; mix until creamy.

  4. Blend in the eggs

    Add eggs one at a time, stirring until the mixture is glossy.

  5. Dry ingredients

    Sift flour, baking soda, and salt together. Gradually mix into wet ingredients to form a soft dough.

  6. Incorporate marshmallows and chocolate

    Fold in marshmallows and chocolate chunks evenly.

  7. Cooling the dough

    Chill for at least 30 minutes to enhance chewiness.

  8. Bake

    Preheat oven to 350°F (175°C). Scoop dough onto baking sheet and bake for 10-12 minutes until edges are golden.

  9. Cooling

    Cool cookies on the sheet briefly, then transfer to a wire rack.

Source: www.kitchenmomy.com · Original recipe source.