Preheat your oven to 350°F. Line an 8-inch square pan with parchment paper, allowing some overhang for easy removal.
In a large bowl, mash the bananas thoroughly until smooth.
Add the remaining ingredients to the mashed bananas and stir until the mixture is well combined.
Pour the batter into the prepared pan and spread it evenly. If desired, sprinkle additional chocolate chips or toppings over the surface.
Bake in the preheated oven for 30 minutes, or until the edges are golden brown and the center is set. Start checking for doneness around the 25-minute mark by inserting a toothpick into the center; it should come out clean or with only a few moist crumbs.
Let the baked mixture cool completely in the pan before lifting it out using the parchment paper. Slice into squares and enjoy!