Prep
0-15 min
Cook
1 HR 35 MIN
Calories
440
Ingredients
1 pkg
(2-layer size) yellow cake mix
1 cup
mashed ripe bananas (about 3)
1 cup
sour cream
3
eggs
1/4 cup
oil
1/2 cup
butter, softened
1 pkg
(16 oz.) powdered sugar
1 cup
finely chopped walnuts
Instructions
Step 1
Heat oven to 350°F.
Step 2
Beat first 5 ingredients with mixer on low speed just until moistened, stopping frequently to scrape bottom and side of bowl. Beat on medium speed 2 min. Pour into greased and floured 13x9-inch pan.
Step 3
Bake 35 min. or until toothpick inserted in center comes out clean. Cool completely.
Step 4
Beat cream cheese and butter in large bowl with mixer until blended. Gradually add sugar, mixing well after each addition.
Step 5
Remove cake from pan. Carefully cut cake crosswise in half using serrated knife. Place 1 cake half, top side down, on plate; spread with some of the frosting. Top with remaining cake half, top side up. Spread top and sides with remaining frosting. Press nuts into sides.