Preheat the oven to 350℉.
In a large bowl, mix together the eggs, vegetable oil and mashed banana. Then, mix in the yellow cake mix until everything is combined.
Pour the batter into a lined loaf pan. Place the pan in the oven and bake for 45 minutes or until a toothpick inserted in the middle of the loaf comes out clean.
Allow the bread to cool for 15 minutes then remove and allow to cool fully on a wire rack. Once cooled, slice and serve.