Irresistibly Chewy Sourdough Oatmeal Chocolate Chip Cookies!

Some of my fondest childhood memories involve the smell of freshly baked cookies filling my grandmother’s kitchen.

She always had a jar of oatmeal chocolate chip cookies on the counter, soft in the center with just the right amount of chewiness.

Top view of a freshly baked sourdough oatmeal chocolate chip cookies on a ceramic plate surrounded by a wooden spoon, a bowl of sugar, a kitchen towel, oats, and chocolate bars

Years later, with a bubbling sourdough starter in my fridge and a craving for something cozy, I decided to give the classic a twist.

The result? A batch of cookies that perfectly balances the rich, tangy depth of sourdough with the warm, familiar sweetness of chocolate and oats.

Why You’ll Love These Cookies

  • Unique Flavor: The sourdough starter adds a subtle tang, making these cookies stand out.
  • Perfect Texture: Soft and chewy with a slightly crisp edge.
  • Great for Reducing Waste: A delicious way to use up extra sourdough discard.
  • Customizable: Swap mix-ins to make them your own—add nuts, dried fruit, or spices!

Ingredients & Substitutions

  • 1 cup unsalted butter, softened (substitute coconut oil for dairy-free)
  • 1 cup brown sugar (use dark brown for deeper flavor)
  • ½ cup granulated sugar (can reduce to ⅓ cup for less sweetness)
  • ¾ cup sourdough starter (discard or active)
  • 2 large eggs (or flax eggs for a vegan version)
  • 1 teaspoon vanilla extract (swap ½ teaspoon for almond extract for added depth)
  • 2 cups rolled oats (quick oats work but slightly alter texture)
  • 1 ½ cups all-purpose flour (sub gluten-free 1:1 flour if needed)
  • 1 teaspoon baking soda (for lift and tenderness)
  • ½ teaspoon cinnamon (adds warmth and enhances flavor)
  • 1 tablespoon cornstarch (for extra chewiness)
  • 1 teaspoon salt (balances flavors)
  • 1 ½ cups chocolate chips or chopped chocolate (mix dark and milk for best results)
Creaming butter and brown sugar in a ceramic bowl with a spatula. Surrounding the bowl are a kitchen towel, a glass bowl of chocolate chips, and a measuring cup.

Prep & Cook Time

ActivityTime
Preparation15 minutes
Chill Time (optional, for better texture)30 minutes
Cooking12-15 minutes
Total Time45-60 minutes

Step-by-Step Instructions

  1. Preheat and prep: Preheat oven to 350°F (175°C). Line a baking sheet with parchment paper.
  2. Cream butter and sugars: In a large bowl, beat butter, brown sugar, and granulated sugar until light and fluffy (about 2 minutes).
  3. Mix wet ingredients: Add the sourdough starter, eggs, and vanilla (or almond extract). Mix until fully combined.
  4. Combine dry ingredients: In a separate bowl, whisk together oats, flour, baking soda, cinnamon, cornstarch, and salt.
  5. Incorporate dry into wet: Gradually mix dry ingredients into the wet mixture until just combined. Avoid overmixing.
  6. Fold in chocolate: Stir in chocolate chips or chopped chocolate evenly.
  7. Chill the dough (optional but recommended): For thicker, chewier cookies, refrigerate for 1-2 hours before baking.
  8. Shape and bake: Scoop dough into tablespoon-sized balls and place 2 inches apart on the prepared baking sheet. Bake for 12-15 minutes, until the edges are golden but centers remain soft.
  9. Cool and enjoy: Let cookies cool on the baking sheet for 5 minutes, then transfer to a wire rack.
A close-up of delectable sourdough oatmeal chocolate chip cookies on a ceramic plate. One cookie is bitten in half.

Expert Tips for the Best Cookies

  • Use room-temperature butter so it creams smoothly with the sugars.
  • Don’t overmix—once the dry ingredients are incorporated, stop stirring to avoid tough cookies.
  • Chilling the dough prevents excessive spreading and enhances flavor.
  • Take cookies out slightly underdone; they’ll firm up as they cool for the perfect chewy texture.
  • Mix up the flavors: Add a teaspoon of cinnamon or swap in white chocolate and macadamia nuts.

Nutrition Facts

NutrientAmount per Cookie (1 cookie)
Calories150
Carbohydrates20g
Protein2g
Fat8g
Sugar10g

Frequently Asked Questions

Can I make these gluten-free?
Yes! A 1:1 gluten-free flour blend works best.

What’s the best way to store these cookies?
Keep them in an airtight container at room temperature for 3-4 days or refrigerate for up to a week.

Can I freeze the dough?
Absolutely! Freeze scooped dough balls and bake straight from frozen, adding 1-2 minutes to the baking time.

How do I make them extra chewy?
Use dark brown sugar and slightly underbake them.

Enjoy Your Homemade Sourdough Oatmeal Chocolate Chip Cookies!

These cookies bring a nostalgic, homemade touch to any occasion.

Whether you’re using up sourdough discard or creating a new family favorite, they’re sure to become a beloved staple in your kitchen!

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