Preheat the oven to 325 degrees. Line a 9-inch square cake pan with parchment paper.
Combine the Sunbutter, coconut oil, and salt in a small saucepan and heat, stirring, over medium heat until melted and combined.
Place the bananas in a large mixing bowl and mash them with a fork. Place the granola in a large food storage bag and smash with a rolling pin until it resembles fine crumbs. Add the granola and Sunbutter mixture to the bowl with the mashed bananas. Stir to combine well. Press the mixture firmly into the prepared pan.
Put the banana chips in the food storage bag and smash with a rolling pin until they are in small pieces. Sprinkle evenly over the top of the mixture. Bake for 35-40 minutes or until golden brown and set. Let cool completely on a wire rack.
Remove from the pan using the parchment. Cut in half, then cut into 10 rectangular pieces.
Can be stored in the refrigerator, covered, for up to a week.