Grease or spray two 8×4 loaf pans with non-stick cooking spray.
Grab a large bowl and add in the cake mix, eggs, oil, and bananas. (Sprinkle in some ground flax seed if desired). You can just break the bananas into a few chunks—no need to mash them ahead of time. Or mash them if they aren't super ripe. Mix with an electric mixer on medium speed for 1 minute (or by hand).
Pour the batter between the two pans.
Bake at 350 degrees F for 35–40 minutes, until a toothpick comes out clean.
Cool in pans for 15 minutes before removing from the pans and then let cool completely on wore racks before slicing.
Slice and serve or wrap and store for a few days in an air tight container with a piece of paper towel in it. I like to wrap and freeze the second loaf.
