Banana Bars with Cream Cheese Frosting

for the bars:
1/2 cup butter, softened
2 cups sugar
3 eggs
3 medium bananas, mashed
1 tsp vanilla
2 cups flour
1 tsp baking soda
pinch salt

for the frosting:
1 pkg (8oz) cream cheese, softened
1/2 cup butter, softened
4 cups powdered sugar
2 tsp vanilla

Preheat oven to 350.
Cream the butter and sugar in a large bowl, until creamy.
Beat in the eggs, bananas, and vanilla.
Stir in the flour, baking powder, and salt.
Spread the batter evenly onto a foil-lined 15x10x1 inch baking pan.
Bake for about 20 minutes, or until a toothpick inserted in the center comes out clean.
Cool on a wire rack, and make the frosting. Beat the cream cheese and butter until fluffy.
Add in the powdered sugar and vanilla, beating until smooth. 
Frost the bars once they have fully cooled. 
Cut into bars.