Easy Sourdough Discard Brownies

Sourdough discard brownies are the best way to use up that extra starter.

These fudgy squares give new life to that jar of discard sitting in your fridge. The natural tang of sourdough adds a subtle depth that works surprisingly well with rich chocolate.

They’re made with basic pantry ingredients you probably already have on hand, and the sourdough starter actually helps create that perfect brownie texture – crispy on top and soft in the middle.

It’s a clever twist on classic brownies that makes good use of something you’d otherwise toss out, and trust me, nobody will guess your secret ingredient.

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Which Chocolate Type Works Best?

For these brownies, you’ll want to focus on good quality semi-sweet chocolate chips since they’re one of the main flavor-makers in this recipe.

While standard chocolate chips from the baking aisle will work just fine, choosing chips with around 60% cocoa content will give you that perfect balance of sweetness and rich chocolate flavor.

Regular chocolate chips tend to have stabilizers that help them keep their shape during baking, but you could also chop up a bar of semi-sweet baking chocolate instead – this often melts more smoothly and can give your brownies an even fudgier texture.

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Options for Substitutions

Let’s talk about what you can swap in these brownies – though keep in mind that some ingredients are key to getting that perfect brownie texture:

• Sourdough discard: This is pretty important for the recipe, but if you’re in a pinch, you can substitute with ½ cup of plain yogurt or sour cream. The texture will be different, but still tasty!
• Chocolate chips: Feel free to use milk chocolate or dark chocolate chips instead of semi-sweet. You can even chop up your favorite chocolate bar – just make sure it’s good quality baking chocolate.
• Cocoa powder: Dutch-process and regular cocoa powder can be used interchangeably in this recipe. Just avoid hot cocoa mix as it contains added sugar and other ingredients.
• Brown sugar: Out of brown sugar? Mix ½ cup white sugar with 1 tablespoon of molasses. Or just use all white sugar – you’ll lose some moisture and caramel notes, but the brownies will still work.
• Butter: You can swap unsalted butter with salted butter – just reduce the added salt to ½ teaspoon. Coconut oil can work too, though it will add a slight coconut flavor.
• Vanilla essence: Vanilla extract, paste, or powder all work here. If you’re out completely, you can skip it – the brownies will still be chocolate-y and good!

Sourdough Discard Brownies FAQ

Can I use active sourdough starter instead of discard, or does it need to be unfed?

Either works perfectly! You can use active fed starter or unfed discard interchangeably in this recipe—the brownies won’t have a noticeable sour taste either way.

How do I know when the brownies are done if I prefer them fudgy versus cakey?

For fudgy brownies, bake for 35 minutes until the toothpick has moist crumbs. For cakey brownies, bake the full 40 minutes until the toothpick comes out mostly clean.

Can I add mix-ins like walnuts, pecans, or extra chocolate chips?

Absolutely! Fold in 1/2 to 1 cup of chopped walnuts, pecans, or extra chocolate chips right before pouring the batter into the pan for added texture and flavor.

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Storage Instructions

Keep Fresh: These sourdough brownies stay moist and tasty when kept in an airtight container at room temperature for up to 5 days. I like to place a piece of parchment paper on top to keep them from drying out. Pro tip: they actually taste even better the next day, as the sourdough flavor develops!

Freeze: Cut your brownies into squares and wrap them individually in plastic wrap, then place in a freezer bag. They’ll keep well in the freezer for up to 3 months. This is perfect when you want just one piece at a time for those chocolate cravings!

Thaw & Serve: When you’re ready for a frozen brownie, just pull one out and let it thaw at room temperature for about an hour. If you want that fresh-baked warmth, pop it in the microwave for 10-15 seconds – it’ll taste like it just came out of the oven. Perfect with a cold glass of milk!

Preparation Time	15-20 minutes
Cooking Time	35-40 minutes
Total Time	50-60 minutes
Level of Difficulty	Medium

Estimated Nutrition

Estimated nutrition for the whole recipe (without optional ingredients):

• Calories: 2200-2400
• Protein: 25-30 g
• Fat: 120-130 g
• Carbohydrates: 300-320 g

Ingredients

For the chocolate blend:

• 2 tsp vanilla essence (use pure vanilla extract for best flavor)
• 12 oz semi-sweet chocolate chips (or dark chocolate for less sweetness)
• 1/2 cup unsalted butter (I like Kerrygold unsalted butter for this)
• 1/2 cup cocoa powder

For the wet ingredients:

• 1/2 cup sourdough starter discard (active or unfed starter works well here)
• 1/2 cup packed brown sugar
• 1 cup white sugar
• 1 egg yolk (adds richness and chewiness to the brownies)
• 2 large eggs

For the dry ingredients:

• 1 cup plain flour
• 1 tsp salt

Step 1: Prepare the Baking Dish and Oven

Preheat your oven to 350°F (176°C).

Line a 9″x9″ baking dish with parchment paper, ensuring it covers the bottom and sides well to prevent sticking and facilitate easy removal of the brownies once baked.

Step 2: Melt the Chocolate Mixture

• 1/2 cup butter
• 1 1/2 cups semi-sweet chocolate chips
• 1/2 cup cocoa powder
• 2 teaspoons vanilla essence

Melt the butter in a small saucepan over low heat.

Add chocolate chips, vanilla extract, and dutched cocoa powder to the melted butter.

Stir the ingredients continuously until the chocolate chips have fully melted and the mixture is smooth.

Remove the saucepan from the heat and set it aside to allow the chocolate mixture to cool slightly.

Step 3: Prepare the Batter

• 2 large eggs
• 1 egg yolk
• 1 cup white sugar
• 1/2 cup brown sugar
• 1/2 cup sourdough starter discard

In a large mixing bowl, beat the eggs, brown sugar, and granulated sugar using an electric mixer for approximately 7-10 minutes until they become light and creamy.

Add the sourdough discard and cooled chocolate mixture to the bowl and beat on low speed until well combined.

Gently fold in the flour and salt with a spatula just until incorporated.

The batter will be very thick at this stage.

Step 4: Pour and Bake

Pour the prepared batter into the lined baking dish, using a spatula to smooth the top for even baking.

Place the dish in the preheated oven and bake for 35-40 minutes or until a toothpick inserted in the center comes out with a few moist crumbs attached.

Step 5: Cool and Serve

Once removed from the oven, allow the brownies to cool completely in the pan.

To serve, lift the brownies out of the baking dish using the parchment paper.

Transfer them to a cutting board and slice into squares.

Enjoy your rich and chewy brownies!