Keto Rye Sourdough Brownies

Prep: 10 minCook: 35 min18 browniesmediumAmerican
Rye Sourdough Brownies with Coconut Sugar and Cacao

These unique brownies combine tangy sourdough starter with rich cacao powder and natural sweeteners for a complex, fudgy dessert. The rye sourdough adds subtle sourness that balances the sweetness from coconut sugar and Medjool dates. Perfect for using up excess starter, these brownies offer a healthier twist on the classic treat with options for dairy-free preparation. The food processor method creates an incredibly smooth batter, resulting in dense, moist brownies that improve in flavor after cooling completely.

VegetarianGluten-FreeNut-FreeKeto

Ingredients

Yield: 18 brownies
  • ½ cup grass-fed butter, or coconut oil
    coconut oil1:1dairy-freedairy-free

    Use solid coconut oil for best texture

    Full guide →
  • 1 cup coconut sugar
    brown sugar1:1traditional

    Regular sugar works but reduces health benefits

    Full guide →
  • 6 Medjool dates, pitted
    other dates1:1budget

    Deglet noor dates work but are less sweet

    Full guide →
  • 1 cup sourdough starter, mature
  • 3 organic or pastured eggs
  • 2 teaspoons vanilla extract
  • 1 teaspoon baking powder
  • ½ cup cacao powder
  • ¼ teaspoon sea salt

Instructions

  1. 1

    Preheat oven to 350 degrees Fahrenheit

  2. 2

    Grease a 9x13 inch baking dish

  3. 3

    Add fat of choice, coconut sugar, and pitted dates to food processor bowl and pulse several times to form coarse crumbs

  4. 4

    Process on high until mixture almost forms a dough-like consistency

  5. 5

    Add remaining ingredients and process on high until smooth

  6. 6

    Pour batter into prepared baking dish

  7. 7

    Bake for 30 to 35 minutes, checking after 25 minutes

  8. 8

    Let cool completely before cutting

Tips

Tip 1

Check brownies at 25 minutes as sourdough can cause faster browning than traditional recipes.

Tip 2

Let brownies cool completely for cleanest cuts and best texture development.

Tip 3

Ensure sourdough starter is mature and active for optimal rise and flavor.

Good to Know

Storage

Store covered at room temperature for up to 5 days or refrigerate for up to 1 week.

Make Ahead

Can be made up to 2 days ahead for improved flavor development.

Serve With

Serve at room temperature or slightly chilled for best texture.

Common Mistakes

Watch

Don't skip cooling time or brownies will crumble when cut

Watch

Don't overbake as sourdough can dry out faster than regular brownies

Substitutions

Dairy-Free Swaps

butter→
coconut oil1:1dairy-freedairy-free

Use solid coconut oil for best texture

Full guide →

General Alternatives

coconut sugar→
brown sugar1:1traditional

Regular sugar works but reduces health benefits

Full guide →
Medjool dates→
other dates1:1budget

Deglet noor dates work but are less sweet

Full guide →
Find more substitutions →

FAQ

Can I freeze these brownies?

Yes, wrap individual pieces tightly and freeze for up to 3 months. Thaw at room temperature before serving.

What if my sourdough starter isn't very active?

Feed your starter 4-6 hours before using to ensure it's bubbly and active for best rise and flavor.

Can I make these without a food processor?

You can mash dates by hand and mix with electric mixer, but texture won't be as smooth.