Good-Cooking - Sour Cream Banana Bread

Ingredients

• 2/3 cup butter or margarine
• 1 1/2 cups granulated sugar
• 2 eggs
• 1 1/2 cups mashed bananas (about 3)
• 2 3/4 cups flour
• 1 teaspoon baking powder
• 1 teaspoon baking soda
• 1/2 teaspoon salt
• 1/2 cup sour cream
• 1 cup chopped pecans or walnuts (optional)