Preheat oven to 350
Spray and 9X9 square inch pan
Combine sugar, oil, vanilla, eggs, banana and sour cream. Stir well.
Add flour, baking soda and salt. Mix in well.
Pour batter into the greased pan.
Bake at 350 for 40 - 50 minutes or until cake springs back when lightly touched in the center.
Cool completely. Then frost with a cream cheese, chocolate or peanut butter frosting.