Combine the flour, baking soda, cocoa, and salt in a large bowl. Whisk together well.
In another large bowl, whisk together the oil, egg whites and eggs for about 30 seconds, until slightly foamy. Add the bananas and sugar and combine well, using the whisk to mash the bananas and then stir together the mixture. It's okay if some medium chunks of banana remain.
Add the dry ingredients to the banana mixture and combine well. Stir in the chocolate chips. Prepare the cups of a 6-count jumbo muffin pan with a lining of baking spray, or paper lining. Fill each ¾ full.
Bake the muffins in an oven heated at 350 degrees Fahrenheit for about 28 minutes, or until a toothpick inserted in the center comes out relatively clean (some chocolate chip will stick to it). Enjoy warm, cold, or reheated.