1 pkg. (2-layer size) yellow cake mix
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
HEAT oven to 350°F. Beat cake mix, eggs, bananas, sour cream and oil with mixer on low until moistened, scraping bottom of bowl often. Beat on medium 2 min. Pour into greased and floured 13x9-inch pan.
BAKE 35 min. or until toothpick inserted in center comes out clean. Cool cake completely in pan on wire rack.
BEAT cream cheese and butter with mixer on medium until blended. Gradually add sugar, beating well after each addition.
REMOVE cake from pan. Carefully cut cake crosswise in half using serrated knife. Place 1 cake half, top-side down, on plate; spread top with frosting. Top with remaining cake half, top side up. Frost top and sides. Press nuts onto sides. Refrigerate leftovers.
Kraft Kitchens Tips
Prepare as directed, using BREAKSTONE'S Reduced Fat or KNUDSEN Light Sour Cream.
How to Neatly Frost the Cake
Freeze cake layers about 20 min. before frosting. This helps to set the crumbs on the cut edges of the cake layers so they don't pull up into the frosting. And don't worry if the frosting does not look perfect on the sides of the cake - the nuts will cover any imperfections.
Variation How to Prepare in Round Cake Pans
Prepare as directed. Pour evenly into 2 greased and floured 8 or 9-inch round cake pans. Bake 30 to 35 min. or until toothpick inserted in centers comes out clean. Cool 10 min. in pans on wire rack; remove from pans. Fill and frost with PHILADELPHIA Walnut Frosting. Store in refrigerator.