01 -
Lightly grease a 9×5 loaf pan with butter or line with parchment paper. Preheat your oven to 350°F (175°C).
02 -
In a large bowl, whisk together the flour, baking powder, baking soda, salt, and cocoa powder until well combined.
03 -
In a separate bowl, mix the sourdough starter, brown sugar, melted butter or oil, eggs, vanilla, and milk until smooth and well blended.
04 -
Pour the wet ingredients into the dry ingredients and stir just until combined - don't overmix. Fold in the chocolate chips and any optional add-ins like nuts or dried fruit.
05 -
Pour the batter into your prepared loaf pan and bake for 55-65 minutes, or until a toothpick inserted in the center comes out clean. Cover loosely with foil if the top browns too quickly.
06 -
Let the bread cool in the pan for 10 minutes, then transfer to a wire rack to cool completely. Dust with powdered sugar if desired before slicing and serving.