Preheat an oven to 350 ℉ and line a loaf pan with parchment paper or grease it with extra oil to prevent sticking.
In a blender combine mashed sweet potato, mashed banana, maple syrup/honey, eggs, vanilla, oil, and vinegar and blend until smooth. Set aside.
In a medium bowl, combine flour, baking powder, baking soda, salt, and cinnamon. Stir together and then pour the contents of the blender into the bowl with the dry ingredients. Mix until well combined and batter has a smooth consistency.
Fold in chocolate chips, reserving some for the top of the bread, if desired.
Pour batter into the prepared loaf pan, using a spatula to spread the batter evenly throughout the pan. Top with a few reserved chocolate chips, if desired.
Bake in the preheated oven for 35-40 minutes.
Let loaf cool in pan for 15 minutes before transferring it to a wire cooling rack. Slice into 8 pieces and enjoy!
Let cool completely and store in an air-tight container in fridge for up to 4 days or in the freezer for a month.