Preheat Oven: Begin by preheating your oven to 350°F (175°C). Grease a 9×9 inch baking pan or line it with parchment paper.

Wet Ingredients: In a large mixing bowl, combine the mashed bananas, melted butter, oil, and sugar. Mix until everything is well combined. Add the eggs one at a time, mixing well after each addition. Stir in the vanilla extract.

Dry Ingredients: In another bowl, sift together the flour, cocoa powder, baking soda, and salt.

Combine: Gradually add the dry ingredients to the banana mixture, mixing just until incorporated. Do not overmix. If you’re using chocolate chips or chunks, fold them into the batter.

Bake: Pour the batter into the prepared baking pan and smooth the top. Bake in the preheated oven for 25-30 minutes or until a toothpick inserted into the center comes out with a few moist crumbs. The baking time might vary based on your oven and the moisture content in your bananas, so keep an eye on them.

Cool and Serve: Remove from the oven and let the brownies cool in the pan for about 10 minutes, then transfer them to a wire rack to cool completely. Once cooled, cut into squares and serve.

Optional Add-ins:

• Chopped walnuts or pecans can be added for a bit of crunch.
• A swirl of peanut or almond butter can be added on top before baking for an extra layer of flavor.