2In a bowl, add ¾ cup of all-purpose flour, 1 ¼ cup of granulated sugar, ½ cup of cocoa powder, and ½ teaspoon of salt. Mix together and set aside.
3In a large pot, melt 1 stick of butter.
4Once butter is fully melted, remove from heat. Add 1 cup of chocolate chips and 1 tablespoon of vanilla extract. Stir until chocolate is fully melted.
5Add dry ingredients to the chocolate mixture and stir until fully combined.
6Add two eggs and ½ cup of sourdough discard. Stir until fully combined.
7Add mixture to a 9x9 baking dish. Sprinkle chocolate chips on top (optional).
8Bake at 350 for 40 minutes, or until a toothpick comes out clean.