Frosted Banana Bars

Preheat oven to 350 degrees F (175 degrees C). 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.