Blue Ribbon Competition-Winning Banana Bread

Ingredients

• 3 large bananas, heavily spotted and overripe (approx. 1.5 cups mashed)
• 1/2 cup unsalted butter, melted and slightly cooled
• 3/4 cup light brown sugar, packed
• 1/4 cup granulated white sugar
• 1 large egg, room temperature
• 1 teaspoon pure vanilla extract
• 1/3 cup full-fat sour cream or Greek yogurt
• 1 1/2 cups all-purpose flour
• 1 teaspoon baking soda
• 1/2 teaspoon fine sea salt
• 1/2 teaspoon ground cinnamon
• 1/2 cup walnuts or pecans, chopped (optional)