Sourdough Discard Brown Butter Brookies (Fudgy, Chewy & Decadent)

Sourdough Discard Brown Butter Brookies are the ultimate dessert mashup, combining rich fudgy brownie layers with chewy brown butter cookie dough and melty chocolate. The nutty depth of browned butter and subtle tang of sourdough discard create incredible flavor and texture. These indulgent bars are perfect for chocolate lovers, bake sales, or anytime you want a bakery-style treat with irresistible gooey layers.

Ingredients

For the Brown Butter Cookie Layer

• ½ cup unsalted butter
• ¾ cup brown sugar
• ¼ cup granulated sugar
• ½ cup sourdough discard
• 1 large egg
• 1 teaspoon vanilla extract
• 1¼ cups all-purpose flour
• ½ teaspoon baking soda
• ½ teaspoon salt
• ¾ cup chocolate chips

For the Brownie Layer

• ½ cup unsalted butter
• ¾ cup granulated sugar
• ½ cup brown sugar
• 2 large eggs
• 1 teaspoon vanilla extract
• ½ cup cocoa powder
• ¾ cup all-purpose flour
• ¼ teaspoon salt
• ½ cup chocolate chips

For Topping

• Melted chocolate for drizzle

Preparation Steps

Step 1: Brown the Butter

Melt butter in a saucepan over medium heat, stirring until golden brown and nutty. Cool slightly before using.

Step 2: Make Cookie Dough

In a bowl, mix browned butter, brown sugar, and granulated sugar. Add sourdough discard, egg, and vanilla. Stir in flour, baking soda, salt, and chocolate chips to form thick dough.

Step 3: Prepare Brownie Batter

In another bowl, melt butter and mix with sugars. Add eggs and vanilla. Stir in cocoa powder, flour, salt, and chocolate chips until smooth.

Step 4: Layer in Pan

Preheat oven to 350°F (175°C). Line an 8×8-inch pan with parchment. Press cookie dough evenly into pan. Spread brownie batter over the top.

Step 5: Bake

Bake 28–32 minutes until edges set and center slightly fudgy.

Step 6: Cool Completely

Cool fully in pan before lifting and slicing for clean layers.

Step 7: Drizzle

Drizzle melted chocolate over cut brookies before serving.

Variations

• Add chopped walnuts or pecans
• Use dark chocolate chips
• Add peanut butter swirl
• Sprinkle sea salt flakes
• Add white chocolate chips

Serving Suggestions

• Serve slightly warm
• Pair with milk or coffee
• Top with ice cream
• Drizzle extra chocolate
• Cut into small squares

Prep Time / Bake Time / Chill Time / Total Time

Prep Time: 25 minutes

Bake Time: 30 minutes

Chill Time: 0 minutes

Total Time: About 55 minutes

Nutritional Info (Approx.)

Calories: 360 per bar

Protein: 4g

Fat: 20g

Carbohydrates: 40g

Conclusion

Sourdough Discard Brown Butter Brookies are rich, fudgy, and chewy with nutty brown butter flavor and gooey chocolate layers. These decadent dessert bars are a perfect combination of brownie and cookie, making them an irresistible treat for any occasion.