Frosted Banana Bars

1/2 c. butter, softened
2 c. sugar
3 eggs
1 1/2 c. mashed bananas
1 tsp. vanilla
2 c. flour
1 tsp. soda
1 pinch salt

Cream butter and sugar. Add everything else. Bake in a 15" x 10" (I use a big cookie sheet and it works great) for 350 F. for 20 minutes. Let cool. Frost with cream cheese frosting.