Sourdough Brownies

By Lily | Last modified on Mar 25, 2026

Featured in: Desserts

If you’re a chocolate lover seeking a dessert that balances rich, fudgy indulgence with a unique tang, these sourdough brownies are your new favorite treat. Their thick, gooey centers wrapped in shiny crackly tops offer an irresistible texture that melts in your mouth with each bite.

Using sourdough starter discard adds depth and subtle complexity to these brownies, enhancing the chocolate flavor while reducing waste. Whether enjoyed with a glass of cold milk or a cup of coffee, these brownies bring a handcrafted touch to any occasion.

Why You’ll Love This Recipe

Rich, fudgy texture with gooey centers and shiny crackly tops perfect for chocolate lovers.
Incorporates sourdough starter discard to add depth of flavor and reduce kitchen waste.
Simple ingredients come together easily for an impressive homemade treat.

Ingredients

Unsalted butter (8 tablespoons, 113 g): Provides richness and moisture, giving brownies their fudgy texture without added saltiness.
Semi-sweet chocolate chips (12 oz., 340 g): Melts smoothly into the batter, imparting deep chocolate flavor and velvety softness.
Dutched cocoa powder (½ cup, 40 g): Intensifies chocolate taste and contributes to the shiny, crackly top; regular cocoa can be substituted.
Vanilla extract (2 teaspoons, 10 g): Enhances overall flavor and balances the rich chocolate with warm, aromatic notes.
Large eggs (2) and egg yolk (1): Bind ingredients and add moisture; yolk adds extra richness for soft brownie centers.
Granulated sugar (1 cup, 200 g): Sweetens the brownie and helps create a crackly top texture when baked.
Dark brown sugar (½ cup, 110 g): Adds moisture and a subtle caramel-like flavor, contributing to chewiness.
Sourdough starter discard (½ cup, 125 g): Adds subtle tang and complexity while making excellent use of extra starter.
All-purpose flour (1 cup, 120 g): Provides structure, balancing the fudgy texture without making the brownies cakey.
Salt (1 teaspoon, 5 g): Enhances chocolate flavor and balances sweetness perfectly.

Instructions

Preheat and prepare baking dish: Set your oven to 350°F (176°C) and line a 9” x 9” baking pan with parchment paper. Proper lining ensures easy removal of brownies and even baking.
Melt butter and chocolate: Over low heat, melt butter in a small saucepan, then add semi-sweet chocolate chips, vanilla extract, and cocoa powder. Stir continuously until smooth. This creates a luscious, glossy chocolate base essential for rich brownies.
Beat eggs and sugars: In a large bowl, use an electric mixer to beat the eggs, egg yolk, granulated sugar, and dark brown sugar for 7-10 minutes. This aerates the eggs, helping to develop a tender crumb and a crackly top.
Combine sourdough and chocolate mixture: Add the sourdough starter discard and melted chocolate mixture into the sugar and egg blend, mixing on low speed until just combined. This integrates the tangy flavor and chocolate without overmixing.
Incorporate flour and salt: Gently fold in the all-purpose flour and salt with a spatula until just combined. Avoid overmixing to maintain a dense, fudgy texture instead of cakey brownies.
Pour batter and bake: Scrape the thick batter evenly into the prepared baking dish, smoothing the surface with a spatula. Bake for 35-40 minutes until a toothpick inserted near the center comes out with moist crumbs. This ensures gooey centers with a set exterior.
Cool and slice brownies: Let the brownies cool completely in the pan to set properly. Lift them out using the parchment paper and cut into 16 squares. Cooling prevents crumbling and makes cutting clean edges easier.

You Must Know

Using sourdough discard adds a subtle tang and reduces waste, enhancing flavor complexity.
Do not overbake to maintain the fudgy center; start checking at 35 minutes.
Ensure eggs and sugars are well beaten to develop the signature crackly top texture.

Storage Tips

Store cooled brownies in an airtight container at room temperature for up to 7 days to maintain freshness. For longer storage, freeze individually wrapped brownies for up to three months and thaw before reheating.

Serving Suggestions

Enjoy these brownies warm topped with a scoop of vanilla ice cream or dusted with powdered sugar. They also pair beautifully with coffee or a glass of cold milk for an indulgent treat.

Professional Tips

Use high-quality semi-sweet chocolate for the best melt and flavor.
Let the melted chocolate mixture cool slightly before mixing to avoid cooking the eggs.
Beat the eggs and sugars thoroughly to create a tender, moist crumb and shiny crackly tops.

FAQs

Can I use regular cocoa powder instead of dutched?: Yes, regular cocoa powder works fine though the flavor will be slightly less mellow and the brownie top may not be quite as shiny.
What is sourdough starter discard?: It is the portion of your sourdough starter you remove before feeding it. This recipe utilizes that discard to add flavor and avoid waste.
Can I make these brownies gluten-free?: You can substitute all-purpose flour with a gluten-free baking blend, but texture may vary slightly.
Why is it important to beat the eggs and sugars for so long?: Beating creates air bubbles that give brownies their signature crackly top and tender texture.
How do I store leftover brownies?: Store in an airtight container at room temperature up to a week or freeze individually wrapped for months.