Preheat oven to 350°F (175°C). Lightly grease a loaf pan.
In a large bowl, combine the brownie mix with the mashed bananas, oil, and applesauce. Mix well until a thick batter forms.
Fold in the optional chocolate chips and nuts, if using.
Pour the batter into the prepared loaf pan and smooth the top.
Bake for 40-45 minutes, or until a toothpick inserted into the center comes out clean.
Let the bread cool in the pan for 10 minutes, then transfer to a wire rack to cool completely.
Slice and enjoy your delicious vegan chocolate bread!