moist banana nut bread recipe

Ingredients: 1 1/2 cups all-purpose flour 1 teaspoon baking soda 1/2 teaspoon salt 1/2 cup unsalted butter, softened 1 cup granulated sugar 2 large eggs 4 ripe bananas, mashed 1/4 cup sour cream or plain yogurt 1 teaspoon vanilla extract 1 cup chopped nuts (such as walnuts or pecans)