Preheat your oven to 350°F (175°C) and prepare a 9x13-inch baking pan by greasing it with butter or lining it with parchment paper.

In a large mixing bowl, combine mashed ripe bananas and melted unsalted butter until well mixed.

Add brown sugar and granulated sugar to the banana mixture, stirring until smooth, then mix in eggs one at a time and stir in vanilla extract.

In a separate bowl, whisk together all-purpose flour, baking soda, and salt, then fold into the banana-sugar mixture.

Gradually incorporate the dry ingredients into the wet mixture until just combined.

Fold in chocolate chips and nuts, ensuring even distribution.

Pour the batter into the prepared pan and spread it evenly.

Bake for 20-25 minutes, or until a toothpick inserted comes out clean or with few crumbs.

Remove from oven and cool in pan for about 10 minutes before transferring to a wire rack.

Once cooled, slice into squares and serve.