Love making this in batches and passing them to friends and neighbors. It's one of my most requested recipes

Ingredients:
½ cup unsalted butter, softened
1 ½ cups sugar
1 cup sour cream
2 eggs
3 ripe bananas, mashed
2 cups all-purpose flour
1 tsp baking soda
¾ tsp salt
½ cup chopped walnuts
2 tsp vanilla extract
For the topping:
3 cups powdered sugar
3 tbsp milk
½ cup unsalted butter
1 ½ tsp vanilla extract
Instructions: