Preheat your oven to 350°F (175°C) and prepare your 9 x 5-inch loaf pan by greasing it thoroughly with butter or cooking spray.

In a large mixing bowl, whisk together 2 cups of all-purpose flour and 1 teaspoon of baking soda until blended.

In a separate bowl, combine ½ cup of melted butter, 1 cup of granulated sugar, ½ cup of sour cream, 2 large eggs, 3 ripe bananas (mashed), and 1 teaspoon of vanilla extract.

Pour the wet banana mixture into the dry ingredients bowl and gently stir until just combined.

If you're using chopped nuts, gently fold them into the batter now, then pour the batter into your prepared loaf pan.

In a small bowl, mix ¼ cup of brown sugar with 1 teaspoon of cinnamon. Sprinkle this mixture over the batter and swirl it through.

Place the loaf pan in the preheated oven and bake for 65 to 70 minutes, or until a toothpick inserted comes out clean.

Once baked, let the banana bread cool in the pan for about 10 minutes.

While the banana bread is cooling, make the glaze by whisking together 1 cup of powdered sugar and 1-2 tablespoons of milk until smooth.

After transferring the cooled bread to a wire rack, drizzle the glaze generously over the top.