Best Banana Cake

2 ½ C flour
1 ¾ C sugar
2 ¼ tsp baking powder
¾ tsp baking soda
1 tsp salt
¾ c (1 ½ sticks) butter (room temperature)
1 ¼ C mashed, very ripe bananas (about 3 medium)
2/3 C buttermilk
2 eggs
2/3 c finely chopped walnuts

Frosting:
1 (3 oz) pkg cream cheese (room temperature)
¼ C butter (room temperature)
2 Tbsp milk
1 tsp vanilla
1/8 tsp salt
1 (1 lb.) box powdered sugar

Preheat oven to 350. Line two 9 inch, round cake pans with wax paper. Mix dry ingredients. Add butter, bananas and 1/3 C buttermilk; beat 2 minutes. Add remaining buttermilk and eggs; beat 2 minutes. Fold in walnuts. Pout into prepared pans. Bake 30 to 35 minutes or until a toothpick inserted in center comes out dry. Cool on racks 15 minutes. Remove from pans and cool completely before frosting Can be baked in 13x9x2 in buttered and floured pan at 350 for 40 minutes.

Frosting: Beat cream cheese and butter until fluffy. Blend in milk, vanilla and salt. Gradually add powdered sugar. Beat until smooth and creamy.