1/2 cup butter, softened
1 1/2 cups white sugar
1 cup sour cream
1 teaspoon vanilla extract
2 cups all-purpose flour
1 teaspoon baking soda
1/4 teaspoon salt
1 cup mashed ripe bananas
1 (16 ounce) container cream cheese frosting
Preheat oven to 350. Grease a 10x15 inch jellyroll pan.
In a large bowl, cream together the butter and sugar until smooth.
Beat in the eggs, one at a time, then stir in the sour cream and vanilla.
Combine the flour, baking soda and salt; stir into the batter.
Finally, mix in the mashed banana.
Spread evenly into the prepared pan.
Bake for 20 to 25 minutes in the preheated oven, until a toothpick inserted into the center comes out clean.
Allow bars to cool completely before frosting with the cream cheese frosting.