Preheat your oven to 350°F (175°C) and prepare your loaf pan.

In a mixing bowl, mash the ripe bananas with a fork until smooth. Stir in the melted butter until well combined.

Add the baking soda and a pinch of salt to the banana mixture, mixing gently.

Stir in the sugar, beaten egg, and vanilla extract until fully incorporated.

Gradually mix in the all-purpose flour until just combined, being careful not to overmix.

In a small bowl, combine the sugar and ground cinnamon for the swirl.

Pour half of the banana bread batter into the prepared loaf pan. Sprinkle half of the cinnamon sugar mixture over the batter.

Pour the remaining batter on top and finish with the rest of the cinnamon sugar mixture. Use a knife or skewer to gently swirl the batter.

Bake in the preheated oven for 60-65 minutes, or until a toothpick inserted into the center comes out clean.

Let the bread cool in the pan for about 10 minutes before transferring it to a wire rack to cool completely.

Slice and enjoy your delicious Cinnamon Sugar Banana Bread!