Combine maple syrup, peanut butter, and butter in a small saucepan. Whisk together over medium heat until the mixture melts and is combined.

Add crisped rice cereal, oats, and crushed banana chips to a medium mixing bowl. Pour melted mixture into the bowl and mix together.

Add mixture into an 8x8x2 inch or 9x9x2 inch parchment lined baking dish. Use a rubber spatula or spoon to make sure the granola is in one even layer. Place dish in the refrigerator for at least 30 minutes to allow the bars to harden.

Remove the block of granola from the dish. Cut into 8-10 bars.

Add Nutella to a small microwave-safe bowl. Heat in the microwave for thirty seconds, just to loosen the Nutella up a bit. Add Nutella to a small sealable plastic sandwich bag. Snip a small hole in one of the corners of the bag. Pipe the Nutella on to the bars. Let sit another 5 minutes to set up before eating.

Bars last at room temperature in an airtight container for up to a week.