Line your baking pan with parchment paper to prevent sticking.
Peel the ripe bananas and mash them thoroughly in a large mixing bowl until smooth with a few small lumps, releasing a sweet, jammy aroma.
Add the rolled oats to the mashed bananas and stir until well combined; the oats should be coated and start to absorb some moisture, creating a sticky mixture.
Stir in the honey or maple syrup, nut butter, and a pinch of salt, mixing until everything is evenly incorporated and the mixture becomes sticky and cohesive.
If desired, fold in chocolate chips or chopped nuts for added texture and flavor distribution.
Transfer the mixture into your prepared pan, pressing down firmly with a spatula or your fingers to create an even, compact layer. This helps the bars hold together nicely.
Bake at 180°C (350°F) for about 15-20 minutes, until the edges turn golden and the top looks set with a toasted aroma filling the kitchen.
Remove from the oven and let the bars cool in the pan for 10 minutes, then lift out using the parchment paper and cool completely on a wire rack for about 20 minutes.
Once cooled, slice into squares with a sharp knife. The bars should be firm yet chewy, with bits of oats and banana visible throughout.
Serve immediately or store in an airtight container at room temperature for up to 3 days, or freeze for longer storage. Reheat briefly if you prefer warm, gooey bars.
