I love the smell of this bread in my house as it cooks

2 cups all-purpose flour
1 teaspoon baking soda
1/2 teaspoon salt
1/2 cup unsalted butter, softened
3/4 cup granulated sugar
2 large eggs
3 ripe bananas, mashed
1/3 cup plain yogurt or sour cream
1 teaspoon vanilla extract
1/2 cup chopped walnuts or chocolate chips (optional)