Fudgy Sourdough Brookies (Chocolate Chip Cookie Brownie Bar)
Picture this: a chocolatey sourdough brownie topped with gooey sourdough chocolate chip cookie dough. This results in the most incredible fudgy sourdough brookies! They’re chewy and rich and have just a hint of tang that makes them irresistible.

If you bake with sourdough, you probably have extra discard on hand. Instead of tossing it, why not use it to create a dessert that’s both indulgent and resourceful? The sourdough discard adds depth of flavor and makes these brookies extra soft and chewy.
What is a sourdough brookie?
A sourdough brookie is a mix of a sourdough brownie and a sourdough chocolate chip cookie. It has a bottom layer of brownie dough topped with chocolate chip cookie dough and baked into a tray bake. Half brownie and half cookie dough for the perfect comfort dessert.

Why you will love this recipe:
Fudgy and gooey: for those of you who like your brownie and cookies soft and chewy, these brookies are perfect for you.
Easy to make: You can whip the dough in minutes, layer it, and bake.
Comfort dessert: nothing is more delicious and comforting than a rich brownie and soft chocolate chip cookie in one dessert bar.
Sourdough goodness: take these brookies to the next level by adding your sourdough discard. It will make the dough super soft and tender and give it a slight interesting tang.

Ingredients needed

Sourdough brownie

Sourdough chocolate chip cookie dough
- Sourdough discard: use it only if it doesn’t have hooch on top. If your sourdough starter is brand new, wait for at least 10 days before using it.
- Butter: it needs to be softened before using it in the recipe. It will make it easier to cream it together with the sugars and it affects the end result of the bake.
- Granulated sugar: I used organic unrefined sugar.
- Brown sugar: will bring a great depth of flavor and moisture to your bake.
- Eggs: used for binding and leavening.
- Flour: I used organic unbleached all-purpose flour.
- Cacao powder: I used organic unsweetened cacao powder.
- Chocolate chips: I used milk chocolate, but you can use dark chocolate if you prefer.
- Vanilla extract
- Baking soda: used as a leavening agent and to react with the acidity of the sourdough discard for the perfect dough.
- Salt: the perfect touch to balance any dessert.
- Optional Chocolate chunks: for topping the brookie before it finishes baking.

How to make sourdough brookies
Make the brownie
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- Preheat your oven to 350°F (176°C).
- With your stand mixer (or hand mixer) cream the softened butter and sugars until it resembles a wet sand texture.
- Add the eggs and vanilla extract and mix until fluffy and lighter in colour.
- Add the sourdough discard but switch to using a spatula and not your mixer anymore. This will insure a light dough. Mix with the spatula until well combined.
- Mix in the cacao powder.
- Start incorporating the flour, baking soda, and salt. Mix until well incorporated.
- The brownie dough should be thick but soft.
- Line your baking pan (preferably metal) with parchment paper. I used a 10” x 8”.
- Put the dough in the pan and spread it evenly with the spatula.
Make the cookie dough
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- With your stand mixer (or hand mixer) cream the softened butter and sugars until it resembles a wet sand texture.
- Add the eggs and vanilla extract and mix until fluffy and lighter in colour.
- Add the sourdough discard but switch to using a spatula and not your mixer anymore. Mix with the spatula until well combined.
- Start incorporating the flour, baking soda, and salt. Mix until well incorporated.
- Add the chocolate chips and fold them into the dough with your spatula.
- As with the brownie dough, the cookie dough should be thick but soft.
- Layer the cookie dough on top of your brownie with your spatula.
- Bake the brookie for 30 to 40 minutes at 350°F (176°C). The centre of the cake should be set but not completely firm. The top should have a nice golden brown crust.
- Optional step: 5 minutes before finishing baking, sprinkle a few small chunks of chocolate for extra crunch and chocolatey delight.
- Let the brownie cool off completely before slicing.
- Slice it into your desired size bars.
- Serve plain or with a scoop of vanilla ice cream.
Note: if you use a non-metal pan the brookie might take longer to bake (about 40 minutes).
How to store the brookies
These sourdough brookies can be stored in an airtight container for up to a week but you can also freeze them for up to a month. Just thaw them at room temperature before using.
Try more chocolate sourdough discard desserts
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Sourdough Discard Brookies (Chocolate Chip Cookie Brownie Bar)
Equipment
- Stand mixer (or hand mixer)
- spatula
- Baking pan (10''x8'')
Ingredients
For the brownie
- 1/3 cup sourdough discard approx. 90g
- 3/4 cup softened butter approx. 170g
- 2/3 cups granulated sugar approx. 133g
- 1/3 cup brown sugar approx. 66g
- 2 eggs
- 1 cup all-purpose flour approx. 120g
- 1/2 cup cacao powder (unsweetened) approx. 50g
- 1 tsp vanilla extract
- 1/2 tsp baking soda (bicarbonate of soda)
- a pinch of salt
For the cookie dough
- 1/3 cup sourdough discard approx. 90g
- 1/2 cup softened butter approx. 115g
- 3/4 cups brown sugar approx. 150g
- 1/4 cup granulated sugar approx. 50g
- 1 egg
- 1 tsp vanilla extract
- 1 1/4 cup all-purpose flour approx. 150g
- 1 cup chocolate chip cookies (milk or dark) approx. 170g
- 1/2 tsp baking soda (bicarbonate of soda)
- a pinch of salt
- a few chocolate chunks to decorate on top (optional)
Instructions
Make the brownie
- Preheat your oven to 350°F (176°C).
- With your stand mixer (or hand mixer) cream the softened butter and sugars until it resembles a wet sand texture.3/4 cup softened butter, 2/3 cups granulated sugar, 1/3 cup brown sugar
- Add the eggs and vanilla extract and mix until fluffy and lighter in colour.1 tsp vanilla extract, 2 eggs
- Add the sourdough discard but switch to using a spatula and not your mixer anymore. This will insure a light dough. Mix with the spatula until well combined.1/3 cup sourdough discard
- Mix in the cacao powder.1/2 cup cacao powder (unsweetened)
- Start incorporating the flour, baking soda, and salt. Mix until well incorporated.1 cup all-purpose flour, 1/2 tsp baking soda (bicarbonate of soda), a pinch of salt
- The brownie dough should be thick but soft.
- Line your baking pan (preferably metal) with parchment paper. I used a 10” x 8”.
- Put the dough in the pan and spread it evenly with the spatula.
Make the cookie dough
- With your stand mixer (or hand mixer) cream the softened butter and sugars until it resembles a wet sand texture.1/2 cup softened butter, 3/4 cups brown sugar, 1/4 cup granulated sugar
- Add the eggs and vanilla extract and mix until fluffy and lighter in colour.1 egg, 1 tsp vanilla extract
- Add the sourdough discard but switch to using a spatula and not your mixer anymore. Mix with the spatula until well combined.1/3 cup sourdough discard
- Start incorporating the flour, baking soda, and salt. Mix until well incorporated.1 1/4 cup all-purpose flour, 1/2 tsp baking soda (bicarbonate of soda), a pinch of salt
- Add the chocolate chips and fold them into the dough with your spatula.1 cup chocolate chip cookies (milk or dark)
- As with the brownie dough, the cookie dough should be thick but soft.
- Layer the cookie dough on top of your brownie with your spatula.
- Bake the brookie for 30 to 40 minutes at 350°F (176°C). The centre of the cake should be set but not completely firm. The top should have a nice golden brown crust.
- Optional step: 5 minutes before finishing baking, sprinkle a few small chunks of chocolate for extra crunch and chocolatey delight.a few chocolate chunks to decorate on top
- Let the brownie cool off completely before slicing.
- Slice it into your desired size bars.
- Serve plain or with a scoop of vanilla ice cream.