Banana-Sour Cream Cake

• 1 (18 ounce) package yellow cake mix
• 3 eggs
• 1 cup ripe banana, mashed
• 1 cup sour cream
• 14 cup vegetable oil
• 1 (8 ounce) package cream cheese, softened
• 12 cup butter, softened
• 4 cups powdered sugar
• 1 cup walnut pieces, finely chopped

1. Heat oven to 350 degrees.
2. Beat cake mix, eggs, banana, sour cream and oil with mixer on low until moistened, scraping bottom of bowl often.
3. Beat on medium 2 minutes.
4. Pour into greased and floured 13x9-inch pan.
5. Bake 35 minutes or until toothpick inserted in center comes out clean.
6. Cool cake completely in pan on wire rack.
7. Beat cream cheese and butter with mixer on medium until blended.
8. Gradually add sugar, beating well after each addition.
9. Remove cake from pan.
10. Carefully cut cake crosswise in half using serrated knife.
11. Place 1 cake half, top-side down, on plate; spread top with frosting.
12. Top with remaining cake half, top-side up.
13. Frost top and sides.
14. Press nuts onto sides.
15. Refrigerate leftovers.
16. Special extra: Sprinkle top with additional chopped nuts.

yellow cake, eggs, banana, sour cream, vegetable oil, cream cheese, butter, powdered sugar, walnut pieces

Taken from www.food.com/recipe/banana-sour-cream-cake-334263 (may not work)