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finished sourdough cranberry oatmeal cookies on a white counter top. The center cookie has a bite taken out.
Sourdough Discard

Sourdough Cranberry Oatmeal Cookies (Slice and Bake Cookies)

Perfect for using up leftover fresh cranberries, these easy slice-and-bake cranberry oatmeal cookies with sourdough starter are going to be a hit!

Prep: 15 minutes
Cook: 15 minutes
Total: 8 hours 30 minutes
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Recipe Index | Ferment | Sourdough Discard

Sourdough Cranberry Oatmeal Cookies (Slice and Bake Cookies)

Perfect for using up leftover fresh cranberries, these easy slice-and-bake cranberry oatmeal cookies with sourdough starter are going to be a hit!

finished sourdough cranberry oatmeal cookies on a white counter top. The center cookie has a bite taken out.

Soft and Chewy Cranberry Oatmeal Cookies

There’s something extra special about baking during the holiday season, and these soft and chewy cranberry oatmeal cookies are the perfect treat to add to your festive holiday spread.

Made with nourishing sourdough discard, tart fresh cranberries, hearty oats, and a touch of creamy white chocolate, these cookies combine cozy and comforting flavors. Whether you’re sharing them with loved ones or enjoying them by the fire, these cookies will indeed become a holiday favorite!

Mixing the Cranberry Oatmeal Cookies

Achieving the perfect cookies requires a strategic approach to mixing the dough. The order in which you combine the ingredients can significantly impact the texture and flavor of your cookies. Here’s a recommended order for mixing cookie dough ingredients:

  • Butter: Start by creaming room-temperature browned butter with your sugar. Creaming the butter and sugars together helps create a light and tender cookie texture.
  • Sourdough Starter: add the sourdough starter as an egg replacement, along with any additional wet ingredients, like vanilla extract, to the butter and sugar. The starter adds moisture and a unique tangy flavor to the cookies.
  • Dry Ingredients: In a separate bowl, combine the dry ingredients: flour, baking soda, baking powder, and salt. Gradually add this mixture to the wet ingredients, stirring until just combined. Overmixing can result in tough cookies, so be careful not to overwork the dough.
  • Cranberry and white chocolate mix-ins: Gently fold in the white chocolate and fresh cranberries. These additions give your cookies their distinct flavor.
  • Chill the Dough: Roll the dough up in parchment paper, then refrigerate it overnight in the fridge or for a few hours in the freezer. Chilling the dough allows the flavors to meld and the cookies to hold shape during the baking.

Chilling the cranberry oatmeal cookie dough

After you mix the cookie dough, you need to form and wrap the dough in parchment paper for chilling. The dough must be firm and chilled solid before you can slice it.

Chilling the dough allows the butter to solidify and fully absorb into the flour. If you try to skip the chill step, the cookies will spread and melt in the oven, and no one wants that.

How to coat and slice cranberry oatmeal cookies

My favorite aspect of slice-and-bake cranberry oatmeal cookies is the crust. After chilling, the logs can be rolled in crunchy toppings like raw sugar, natural sprinkles, or nuts, adding texture and flavor.

To coat the cookie dough log, spread the toppings evenly on a sheet pan, then roll and press the log into them. If the chilled log doesn’t stick well, I alternate between rolling and pressing the coating with my hands.

If the coating isn’t adhering, you can brush the cookie dough logs with an egg wash made of 1 egg white and 1 tablespoon of water to help it stick better.

The best technique to slice the cookie dough

These cookies are filled with chunky bits, making them visually appealing and delicious, but slicing can be tricky.

Use a large, extremely sharp knife and cut quickly, pressing down firmly without sawing back and forth.

Can the cookie dough ferment in the fridge overnight?

For best results, chill the dough overnight in the fridge. This allows for a long fridge ferment, making the cookies easier to digest. The dough can be kept in the fridge for up to 2 days before slicing and baking.

Can I freeze the dough?

Yes! You can freeze either the logs or the sliced cookie. If freezing, place the logs rolled in parchment paper in an airtight container.

More Sourdough Cookie Recipes to Try

  • Sourdough Miso Chocolate Chip Cookies with Brown Butter
  • Lemon Blueberry Cookies (Blueberry Muffin Cookies)
  • Sourdough Chocolate Chip Cookies with Pumpkin and Pecans
finished sourdough cranberry oatmeal cookies on a white counter top. The center cookie has a bite taken out.
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finished sourdough cranberry oatmeal cookies on a white counter top. The center cookie has a bite taken out.
Sourdough Discard

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Sourdough Cranberry Oatmeal Cookies (Slice and Bake Cookies)

Perfect for using up leftover fresh cranberries from the holidays, these easy slice-and-bake cranberry oatmeal cookies with sourdough starter are going to be a hit!

  • Prep: 15 minutes
  • Cook: 15 minutes
  • Total Time: 8 hours 30 minutes

Ingredients

  • 170 g all-purpose flour
  • 50 grams rolled oats
  • 1/4 tsp salt
  • 115 g salted butter*
  • 150 g sugar
  • 100 g thick sourdough starter*
  • 1 tsp vanilla extract
  • 3/4 cup minced fresh cranberries (or craisins)
  • 1/2 cup chopped white chocolate (or chips)
  • sprinkles (optional, for coating)

Instructions

  1. If you’d like to make these soft scoop-and-bake cookies instead, you can! See notes!
  2. Brown the butter in a small saucepan until bubbly, and dark golden. Stir it continuously, careful to not burn it.
  3. Remove from heat and allow the butter to cool completely to room temperature.
  4. In a separate bowl, combine the dry ingredients (flour, oats, salt).
  5. Once the butter has cooled completely but is still liquid, to a large bowl add the brown butter, sugar, vanilla extract, and sourdough starter. Combine with a whisk or hand mixer until even.
  6. Fold the combined dry ingredients into the wet ingredients. Stir until well combined.
  7. Add your chocolate and cranberries.
  8. Form the dough into a long shape and wrap it tightly in parchment paper. Refrigerate overnight.
  9. After refrigerating, preheat the oven to 350°
  10. (Optional) sprinkle some sugar and sprinkles onto a sheet pan. Unwrap the cookie dough and roll the log in the toppings.
  11. Line a cookie sheet with parchment paper. Slice the cookie dough into half inch thick slices.
  12. Place the cookie dough slices about two to three inches apart on the lined cookie sheet.
  13. Bake for 15-18 minutes or until the edges are a very pale golden brown and the tops have turned matte.
  14. Let them sit on the cookie sheet until they are completely cool.

Notes

  • You can use discard from the fridge or active starter. Either way it is “discarded” into this recipe since it is not used for rise. I keep a thick starter, so a thin watery starter will give you a different texture in these cookies.
  • if you do not like a cookie with a balanced salty-sweet flavor, use unsalted butter or reduce the added salt.
  • To make these scoop-and-bake instead of slice-and-bake: add 1/4 tsp baking powder and 1/4 tsp baking soda to the dry ingredients. Refrigerate the dough in a covered bowl, then scoop with a cookie scoop and bake at 350°F for 15 minutes. 

Did you make this recipe?

Please leave a 5-star review below if you loved it! Tag @cultured.guru on Instagram

 

Nutrition information is auto-calculated and estimated as close as possible. We are not responsible for any errors. We have tested the recipe for accuracy, but your results may vary.

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Kaitlynn Fenley Author, Educator, Food Microbiologist
Kaitlynn is a food microbiologist and fermentation expert teaching people how to ferment foods and drinks at home.
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  1. Anonymous
    12|22|2024

    What is the oven temperature?

    Reply
    1. Kaitlynn Fenley
      12|22|2024

      350 F (listed in direction step 8)

      Reply
  2. Kacie
    12|14|2025

    There is no brown sugar in the ingredients list but in the directions it says to add brown sugar and granulated sugar. How much brown sugar do we need?

    Reply
    1. Kaitlynn Fenley
      12|15|2025

      I’m not seeing “brown sugar” anywhere in my directions. In step 5, it says “brown butter, sugar”

      Reply

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A lot of people think vinegar kills all microbes b A lot of people think vinegar kills all microbes because shelf stable pickles do not contain microbes. But with shelf stable pickles, it’s the pasteurization/sterilization via hot water bath or pressure canning that makes shelf stable pickles free of microbes.

Hot hot hot acid in a pressurized environment does kill, well…most microbes. 

Think about “refrigerator pickle” recipes, though. They need to be stored in the refrigerator because vinegar alone doesn’t stop fermentation.

Fridge pickles are made without pasteurization/sterilization (canning) so they will wild ferment without refrigeration, and not necessarily in a good way because there’s not enough salt. 

All vinegar is made via fermentation too, and vinegar fermentation involves acetic acid bacteria, but also a ton of LAB, mainly Lactobacillus, Pediococcus, and Leuconostoc (the same genera you’d find in fermented veg.)  I linked a reference paper in my fermented mushroom recipe blog, so you all can read about the LAB involved in vinegar fermentation. 

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I will not ever wild lacto ferment just beets agai I will not ever wild lacto ferment just beets again lol. Mixing with cabbage for beet sauerkraut is the best though! 

“Lacto fermented beets” was the first ferment I tried to make after learning sauerkraut in college. My best friend Sidney came over and we used these gorgeous beets from the farmers market, with 2.5% salt, and some spices. Well, it ended up tasting like beet moonshine and it was just… not good.

But it was a conduit for learning. Those beets were my first lesson in how different sugars and growth in the rhizosphere vs the phyllosphere influences fermentation. 

Cabbage and the cabbage microbiome offer a lot to balance out beets in fermentation, and I think mixing into a sauerkraut is the only way to go for lacto fermenting beets! 

Try googlin’ “beet and red cabbage sauerkraut” and you’ll see my recipe, I’m Cultured Guru.
Squash is the secret ingredient! My Roasted Butte Squash is the secret ingredient!

My Roasted Butternut Squash Hot Sauce recipe is free on my website! I didn’t cook this one, so yes it’s still probiotic.

When lactic acid bacteria ferment the starches in winter squash, they naturally convert them into emulsifying compounds called exopolysaccharides. So when we blend our hot sauce after fermentation, there’s no watery separation in the bottle. Roasting the squash with the garlic for the recipes also adds such good flavor! 

Definitely make sure it’s fully fermented and not bubbling anymore before you blend and bottle. Otherwise, it’ll carbonate in the cute little hot sauce bottles.

#hotsauce
Myth Busting: Yes, the SCOBY IS the pellicle! Plee Myth Busting: Yes, the SCOBY IS the pellicle! Pleeeease stop saying it’s not. 😌



Watch till the end, I show you how to grow one!



This is a little tidbit from what I teach in the Kombucha lesson in our Fermented Drinks Semester online course!

I also share this recipe FOR FREE just ✨GOOGLE✨ “cultured guru SCOBY” and you’ll see my full recipe with the perfect sugar to tea ratios for growing, feeding and maintaining a kombucha SCOBY.

#kombucha
And the knife stays in the box. GOOGLE “sourdoug And the knife stays in the box. 

GOOGLE “sourdough king cake” my recipe is the first one! 👑☂️💚✨

If you’re like me and prefer from scratch, homemade everything, you’ll definitely want to try this king cake for Mardi Gras! I used organic naturally dyed sprinkles and all that jazz too. 

If you just search “sourdough king cake” on google you’ll see my recipe, it’s usually the first one. 

My main tips for making this:
✨use a very active starter or throw in some instant yeast with your starter
✨make sure the dough is actually proofed before shaping it. If it’s cold in your house it will take longer. 
✨please follow directions! You can cold ferment the dough in the fridge after it doubles in size and BEFORE filling and shaping.

🎵Song is Casanova by Rebirth Brass Band
Fermentation is a gift from the microbes of this e Fermentation is a gift from the microbes of this earth.

When we had a food business, I could never shake the feeling that fermentation is not meant to be sold to you from a fluorescently lit grocery shelf in an endless cycle of waste. Fermentation is meant to be cultivated in your home, with your hands, with intention and love in a sustainable, grateful practice of reciprocity and nourishment. 

This is the story of how we got here. 

After so many lessons learned, our small fermentation business is now value aligned, peaceful, fulfilling, and happy.  It often seems like the gut feelings (the microbes within us) guided us in the right direction. To teach. 

You can learn for free on our blog, or you can enroll in our online courses (we extended our new year sale!) Either way, with me as your teacher, you’ll learn to adopt a holistic perspective on the microbial ecosystems that influence our food, lives, and the planet.
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