Place 1/2 cup of softened butter in the bowl of your mixer. Add 1/2 cup of sugar and beat until fluffy.
Add 2 beaten eggs, 1 cup of sour cream and 1 tsp. of vanilla extract.
Add 1 tsp. of baking soda.
Then add 2 cups of flour.
Beat in 1 cup of mashed bananas and blend until smooth.
Pour the batter into a 9x13 baking pan which has been sprayed with cooking spray and lined with parchment paper.
Bake in a 350 degree oven for approximately 25 minutes until a toothpick inserted in the middle comes out clean. It should spring back when you touch it. Allow it to cool.
Put 1 package of cream cheese in your mixing bowl and 1/2 cup of softened butter. Add 2 tsp. of vanilla and beat until smooth. Mix in 4 cups of powdered sugar and beat until combined. Spread on the cooled cake.
Refrigerate until chilled and cut into bars.
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