In a bowl, mash peeled bananas with a fork or with a KitchenAid paddle
Mix in the butter, oil, vanilla, and sugar
In a separate bowl mix the dry ingredients together; flour, cocoa, salt, and baking soda
Mix ⅓ of the dry ingredients with the wet, scraping down the bowl before adding another scoop of the flour mixture.
Stir in chocolate chips and nuts (optional)
Grease 1 large loaf pan or 2 smaller pans (batter should fill ¾ to top)
Bake 350F until a toothpick comes out clean (just make sure you don't hit a choc chip) 1 large loaf should take 55 -60 minutes and 2 smaller loaves will take approximately 35-40 minutes. Once mine get close, I just shut the oven off and leave the loaves in oven for approximately another 10 min, loaves always come out perfectly moist!
Let the loaves cool on the counter for 45 min