Banana Bars with Cream Cheese Frosting

I love just about any bar as long as it is moist.  But my absolute favorite cake is banana bars with cream cheese frosting. I have another recipe on my blog for banana cake and it is very good also but I think for now that this is my new favorite banana bar recipe. 

1/2 cup butter, softened
1-1/2 cups sugar
2 eggs
1-1/2 tsp vanilla extract
2 cups flour
1 teaspoon baking soda
1/2 tsp salt
1 1/2 cups mashed ripe bananas (about 3 medium)
1 cup (8 oz.) sour cream

 Directions:
 1.   In a large bowl, cream butter and sugar until light and fluffy. Add eggs, one at a time, beating well after each addition. Stir in vanilla. Combine the flour, baking soda, and salt; add to the creamed mixture alternately with bananas and sour cream, beating well after each addition.
2.  Pour into a greased 15x10x1 jelly roll pan. Bake at 350° for 20-25 minutes or until a toothpick inserted near the center comes out clean. Cool completely on a wire rack.
3.  Frost with my favorite cream cheese frosting. 
4.  Add nuts on top - they add a special touch
5.  Enjoy