Preparation Steps

• Preheat oven to 350°F and prepare a 9x9 inch baking pan with non-stick spray or parchment paper.
• Roughly chop the semi-sweet chocolate and place into a microwave-safe bowl.
• Slice the butter into smaller pieces and add to the chocolate. Microwave for 1 minute, stir, then microwave another 30 seconds. Stir thoroughly until melted and combined.
• Add granulated sugar to the chocolate mixture and stir well to combine.
• Mix in vanilla extract, eggs, and salt until batter is smooth and well incorporated.
• Stir in the sourdough starter until the batter is smooth and even.
• Pour batter into the prepared pan and bake for 25 to 28 minutes or until a toothpick inserted comes out with a few moist crumbs. Avoid overbaking for fudgy texture.