Preheat oven to 350°. In a large bowl, cream butter and sugar until light and fluffy. Add eggs, sour cream and vanilla. Combine flour, baking soda and salt; gradually add to creamed mixture. Stir in bananas.
Spread into a greased 15x10x1-in. baking pan. Bake 20-25 minutes or until a toothpick inserted in the center comes out clean (do not overbake). Cool.
For frosting, in a large bowl, beat cream cheese, butter and vanilla until fluffy. Gradually beat in enough confectioners' sugar to achieve desired consistency. Frost bars. Store in the refrigerator.
Notes
Banana Bars with Cream Cheese Frosting
I make these moist bars whenever I have ripe bananas on hand, then store them in the freezer to share later at a potluck. With creamy frosting and big banana flavor, this treat is a real crowd-pleaser. —Debbie Knight, Marion, Iowa
For the most intense flavor, use bananas with plenty of brown spots on them. Great way to use up leftovers in your fruit bowl!
Get crunchy by adding toasted walnuts or black walnuts to the batter, or sprinkling them over the frosting.