Pre-heat oven to 425 degrees F and line a standard 12 cup non stick muffin tin with paper liners.
In a large bowl, whisk together sugar, butter, egg, and vanilla.
Whisk in mashed bananas.
Add in flour, cocoa powder, baking soda, baking powder, cinnamon, and salt. Use a spatula to mix. Don’t over mix.
Gently stir in dark chocolate chunks.
Scoop evenly into prepared muffin tin. You should get 12 muffins.
Top with a few more chocolate chips.
Bake for 5 minutes at 425 degrees F and then lower heat to 350 degrees F (keep muffins in oven)
Bake an additional 12-14 minutes, or until a toothpick comes out clean.
Remove from pan and enjoy!
