Banana Sour Cream Bread

INGREDIENTS

• 1/4 cup white sugar
• 1 teaspoon ground cinnamon
• 3/4 cup butter
• 3 cups white sugar
• 3 eggs
• 6 very ripe bananas, mashed
• 1 (16 ounce) container sour cream
• 2 teaspoons vanilla extract
• 2 teaspoons ground cinnamon
• 1/2 teaspoon salt
• 3 teaspoons baking soda
• 4 1/2 cups all-purpose flour
• 1 cup chopped walnuts (optional)