Preheat your oven to 350°F (175°C). Line your baking pan with parchment paper or lightly grease it with canola oil to prevent sticking.
In your mixing bowl, use a fork or potato masher to mash the banana until smooth, with just a few small chunks remaining for texture.
Add the canola oil, honey, vanilla extract, and water to the mashed banana. Stir well until all the wet ingredients are fully incorporated.
In the same bowl, add the rolled oats, cinnamon, and salt. Stir everything until the oats are evenly coated and the mixture starts to thicken.
Gently fold in the handful of chocolate chips, distributing them evenly throughout the batter.
Pour the batter into your prepared pan and spread it out evenly with a spatula or the back of a spoon. Press down gently to compact the mixture.
Place the pan in the preheated oven and bake for 25-30 minutes, or until the edges are golden and a toothpick inserted into the center comes out clean or with a few moist crumbs.
Allow the bars to cool completely in the pan on a wire rack. Once cooled, lift the bars out using the parchment paper edges if used, and slice into squares or rectangles.