Preheat the Oven: Begin by preheating your oven to 350°F (175°C). Grease or line an 8-inch baking pan with parchment paper for easy removal.
Mix Bananas and Butter: In a bowl, mash the ripe bananas with a fork. Stir in the melted butter until well combined.
Add Sugar and Egg: Mix in the brown sugar, beaten egg, and vanilla extract until smooth.
Combine Dry Ingredients: In another bowl, whisk together the flour, baking soda, and salt.
Combine Mixtures: Gradually add the dry ingredients to the banana mixture, stirring just until combined. Do not overmix!
Add Chocolate Chips: Gently fold in the chocolate chips until well distributed.
Bake: Pour the batter into the prepared baking pan and smooth the top. Bake for 25-30 minutes or until a toothpick inserted into the center comes out clean.
Cool and Slice: Allow the bars to cool in the pan for about 10 minutes, then transfer to a wire rack to cool completely. Cut into squares and enjoy!