Preheat oven to 375 F. Line muffin tins with liners.
In a large bowl, combine flour, cocoa powder, baking soda, baking powder, and salt. Mix in chocolate chips.
In a medium bowl, beat together the egg, bananas, white sugar, brown sugar, oil and vanilla extract. Stir into the flour mixture just until blended. Spoon batter into muffin cups.
Bake for 18 minutes or until inserted toothpick comes out clean.
Recipe by Sugar, Spice and Family Life at https://sugarspiceandfamilylife.com/2017/04/chocolate-banana-muffins-recipe.html