Step 1

Create a double-boiler by filling a small saucepan halfway with water and placing over medium-high heat on the stovetop.

Step 2

Place a large glass bowl over the top of the saucepan, then add the chocolate and butter together in the bowl, stirring occasionally until melted and smooth.

Step 3

While the chocolate and butter are melting, butter an 8×8 pan, and preheat the oven to 350 degrees.

Step 4

Once chocolate and butter are melted and smooth, remove the bowl from the double-boiler.

Step 5

Add sugar and vanilla to the chocolate and mix well.

Step 6

Add sourdough starter and eggs and mix well with a whisk until the batter is smooth.

Step 7

Pour batter into your greased pan and bake in the oven, at 350 degrees, for 10 minutes.

Step 8

Remove brownies from oven, top with chocolate chips, then place back into the oven and continue baking for about 15-20 minutes, or until baked through and a knife, when inserted into the center, comes out clean.

Step 9

Remove brownies from the oven and let rest on a cooling rack for 10 minutes.