Preheat oven to 425 degrees Fahrenheit. Line a bread loaf pan (affiliate link) with parchment paper or grease with cooking spray. Set aside.
To a large bowl, add the flour, cocoa powder, dark brown sugar, salt, baking powder and baking soda. Whisk together until combined.
To a large liquid measuring cup or small bowl, mix the applesauce, vegetable oil, eggs, plain yogurt, sourdough discard and vanilla extract until combined. Pour into the center of the flour mixture and mix together until barely combined with just a few dry streaks.
Gently fold in the chocolate chips. Pour into the prepared baking loaf pan.
Bake at 425 degrees Fahrenheit for 10 minutes. After ten minutes reduce the temperature to 350 degrees Fahrenheit and bake for 40-50 minutes until a sharp knife or toothpick is inserted into the center and comes out clean.
Let cool completely before slicing and enjoy!
