Preheat your oven to 350°F (175°C) and grease a 9x5-inch loaf pan.

In a mixing bowl, combine mashed ripe bananas, granulated sugar, brown sugar, melted unsalted butter, eggs, and vanilla extract until well blended.

Sprinkle baking soda and salt over the mixture, then gradually fold in all-purpose flour until just combined.

In a small bowl, mix cinnamon and granulated sugar for the cinnamon swirl.

Pour half of the banana bread batter into the loaf pan, sprinkle half of the cinnamon sugar, then layer the rest of the batter and top with remaining cinnamon sugar.

Gently swirl the batter in the pan with a knife for a marbled effect.

Bake in the oven for 50-60 minutes until a toothpick comes out clean.

Let the bread cool in the pan for 10-15 minutes before transferring to a wire rack.

Prepare the glaze by mixing powdered sugar and milk until smooth.

Once cooled, drizzle the glaze over the bread and let it set before serving.