Banana Bars with Banana Frosting

INGREDIENTS
1/2 cup butter, softened
1 1/2 cups white sugar
2 eggs
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

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.

Frosting:

2 tablespoons butter, melted
1 teaspoon vanilla extract
2 cups confectioners' sugar
1/2 ripe banana
1/2 teaspoon salt
1/4 teaspoon lemon juice

In a medium bowl, mix together the melted butter, 1 teaspoon vanilla, confectioners' sugar, 1/2 banana, 1/2 teaspoon of salt and 1/4 teaspoon lemon juice using an electric mixer. Beat until smooth. Spread over cooled bars and then cut into squares.