Creating Cinnamon Swirl Banana Bread is a straightforward process. Follow these easy steps for the best results:

1. Preheat the Oven: Preheat your oven to 350°F (175°C) and grease a 9×5-inch loaf pan.
2. Mash Bananas: In a large mixing bowl, mash the ripe bananas using a fork until smooth.
3. Mix in Butter: Stir the melted butter into the mashed bananas until well combined.
4. Add Sugar and Egg: Mix in the granulated sugar, beaten egg, and vanilla extract until smooth and creamy.
5. Combine Dry Ingredients: Sprinkle the baking soda and salt over the mixture then stir to combine.
6. Stir in Flour: Gradually add the all-purpose flour, mixing just until incorporated. Be careful not to over-mix.
7. Prepare Cinnamon Mixture: In a small bowl, combine the cinnamon and brown sugar.
8. Layer Batter: Pour half of the banana batter into the prepared loaf pan, spreading it evenly across the bottom.
9. Add Cinnamon Swirl: Sprinkle half of the cinnamon mixture over the batter. Then pour the remaining banana batter over this layer.
10. Finish with Cinnamon: Sprinkle the remaining cinnamon mixture over the top of the second layer of batter.
11. Swirl the Mixtures: Use a knife or skewer to gently swirl the cinnamon mixture into the banana batter—create a marbled effect, being careful not to overdo it.
12. Bake: Place the loaf pan in the preheated oven and bake for 50-60 minutes, or until a toothpick inserted in the center comes out clean.
13. Cool Down: Once baked, remove the loaf from the oven and allow it to cool in the pan for about 15 minutes, then transfer it to a wire rack to cool completely.

These simple steps will guide you to create a loaf of Cinnamon Swirl Banana Bread that is not only delicious but also filled with the comforting aroma of home.