The best cake ever!

I made this cake yesterday and oh my gooodness was it good! Go make it right now! It's soooooo yummy!

Banana Sour Cream Cake

1 pkg. (2-layer size) yellow cake mix
3 eggs
1 cup mashed ripe bananas (about 3 bananas)
1 cup BREAKSTONE'S or KNUDSEN Sour Cream
1/4 cup oil
1 pkg. (8 oz.) PHILADELPHIA Cream Cheese, softened
1/2 cup (1 stick) butter, softened
1 pkg. (16 oz.) powdered sugar (about 4 cups)
1 cup PLANTERS Walnut Pieces, finely chopped

PREHEAT oven to 350°F. Grease and flour 13x9-inch baking pan; set aside. Beat cake mix, eggs, bananas, sour cream and oil in large bowl with electric mixer on low speed just until moistened, stopping frequently to scrape bottom and side of bowl. Beat on medium speed 2 min. Pour into prepared pan.

BAKE 35 min. or until wooden toothpick inserted in center comes out clean. Cool completely.

BEAT cream cheese and butter in large bowl with electric mixer on medium speed until well blended. Gradually add sugar, beating well after each addition.

REMOVE cake from pan; cut crosswise in half. Place one cake half, top-side down, on large serving plate; spread top with frosting. Top with remaining cake half, top side up. Frost top and sides of cake with remaining frosting. Carefully press walnuts into frosting on sides of cake. Store in refrigerator.