3 tbsp. milk or half and half
1 1/2 tsp. vanilla
3 3/4 cups powdered sugar
1/2 cup unsalted butter
1/2 cup chopped walnuts (optional)
3/4 tsp. salt
1 tsp. baking soda
2 cups flour
2 tsp. vanilla
4 ripe bananas, mashed
2 eggs
1/2 cup unsalted butter, softened
1 cup sour cream
1 1/2 cups sugar