Preheat oven to 350 degrees. Spray a 9x13 baking pan with non-stick cooking spray.
In a large bowl, mash bananas. Add eggs and oil. Mix well.
Mix in yellow cake mix until all ingredients are blended together.
Transfer batter to prepared baking dish. Smooth batter evenly in pan.
Bake for 45 to 50 minutes or until a toothpick inserted in the middle comes out clean.
Cool completely.
Frost with your favorite chocolate frosting or dust with powdered sugar.
Notes
The calories shown are based on the cake being cut into 15 pieces, with 1 serving being 1 slice of unfrosted cake. Since different brands of ingredients have different nutritional information, the calories shown are just an estimate. **We are not dietitians and recommend you seek a nutritionist for exact nutritional information.**