1 (18.25 ounce) package yellow cake mix
1 1/3 cups vegetable oil
4 bananas, mashed
Preheat oven to 350 degrees F (175 degrees C). Grease a 9x13 inch pan.
In a mixing bowl, combine cake mix, eggs, oil, and bananas. Pour mixture into the prepared pan.
Bake in preheated 350 degrees F (175 degrees C) for 35 to 40 minutes.