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Preheat the oven to 160C/320F. Grab a 9" x 9" brownie pan - it's up to you whether you grease the pan with butter or line it with parchment paper.
In a bowl, add the all purpose flour, white sugar, cocoa powder, salt and baking powder. Whisk the dry ingredients together until well combined.
Place the chocolate chips in the bowl and mix until they are all coated in the flour mixture.
On top of the dry ingredients, add the melted butter, 2 eggs, vanilla extract and sourdough starter. Using a spatula, gently mix all of the wet and dry ingredients together, ensuring that the sourdough starter is well combined (see notes for more info on this).This is a thick brownie mixture - that’s ok, it’s meant to be like this.
Place the sourdough brownie mixture into your prepared pan and bake for 35 minutes at 160C/320F. Because this is a thick mixture, you might need to push the mixture out to the edges of the pan before placing it in the oven.
Check the sourdough brownies at 35 minutes by inserting a tooth pick - you want it to come out wet still but they should be crackly and baked on top.
Remove from the oven and allow to cool in the pan for around 30 minutes. Then remove from the pan and allow to cool completely on a wire rack before slicing into squares.