Add the milk, canola oil, vanilla, and honey. Mix well.
In a separate bowl, mix together the flour, cocoa, baking powder, baking soda, cinnamon, and salt.
Add the flour mixture to the banana mixture and stir just until blended. Stir in the chocolate chips if you are using them.
Scoop the muffin batter into a muffin pan that has been coated with non-stick spray or lined with muffin papers.
Bake the muffins for 16 - 20 minutes. The muffins are done when you insert a toothpick in the center of one of the muffins and it comes out clean.
Cool slightly, then remove the muffins from pans and finish cooling on a rack.
Notes
*If you are making mini-muffins, bake them for 12 - 14 minutes. Store the muffins in a covered container for 2 to 3 days.Store in the refrigerator if you want them to last longer.