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