Banana Walnut Cake

I had planned on doing this cake in a bundt pan but didn't have any cooking spray so I went with a 13x9. I also realize that we're all trying to watch it a little bit in the new year so I tried to keep it a bit healthier.

What you'll need:

Yellow Cake Mix
1 C Milk
4 ripe bananas
4 egg whites

Mix everything together. Bake cake according to directions on box and frost with cream cheese frosting when it's cool.