For the Banana Bread:

• 2 cups all-purpose flour
• 1 tsp baking soda
• ½ tsp salt
• ½ tsp cinnamon (optional)
• ½ cup unsalted butter (softened)
• ¾ cup light brown sugar
• 2 large eggs
• 3 ripe bananas, mashed (about 1 cup)
• 1 tsp pure vanilla extract
• ½ cup plain Greek yogurt or sour cream
• ¾ cup chopped pistachios (plus extra for topping)