Preheat your oven to 350°F (175°C) and grease a 9x5 inch loaf pan with butter or non-stick spray.

In a large mixing bowl, mash 3 large overripe bananas until smooth.

Add 1/2 cup of melted unsalted butter into the mashed bananas and stir until well combined.

Whisk in 2/3 cup of granulated sugar, 2 room temperature eggs, and 1 teaspoon of vanilla extract.

In a separate bowl, sift together 2 cups of all-purpose flour, 1 teaspoon of baking soda, 1/2 teaspoon of baking powder, 1 teaspoon of cinnamon, and 1/4 teaspoon of salt.

Gradually fold the flour mixture into the banana mixture until just combined.

Pour the batter into the prepared loaf pan.

Place the loaf pan in the preheated oven and bake for approximately 60 minutes.

After baking, allow the One Bowl Banana Bread to cool in the pan for 5-10 minutes.