To Prep: Preheat oven to 350°F and coat a 9 x 13 inch cake pan with non-stick cooking spray.
Add all cake ingredients (except chocolate chips) to a large mixing bowl and whisk until just combined (about 100 strokes).
Fold in the chocolate chips with a silicone spatula.
Scoop batter into prepared pan and bake for about 28 minutes at 350°F. You'll know the cake is done when a toothpick inserted in the middle comes out clean.
Remove cake from oven and place the pan on a wire rack to cool while you prepare the frosting.
Add icing ingredients to bowl of stand mixer and blend until well combined and spreadable.
Use an offset spatula to spread the frosting in an even layer on top of the completely cooled cake.
Notes
Nutrition information is provided as an estimate only.Prep Tips:
Bananas: Use ripe bananas and mash well for smooth batter.
Frosting: Thin with milk or thicken with powdered sugar as needed. Peanut butter frosting is naturally thicker; chocolate frosting works too.
Storage: Store covered 2–3 days at room temp or up to 5 days refrigerated; bring to room temp before serving.