Preheat your oven to 350°F.
Line an 8x8 inch baking dish with parchment paper. I let enough paper go up the sides for easy removal later.
Mash the bananas in a large bowl.
Mix in your sunbutter and oats.
Spread the dough evenly throughout your baking dish.
Bake for about 20 minutes, or until a tester comes out clean.
Cool for 20 minutes, then lift the bars out of the pan using the sides of the parchment paper.
Drizzle your bars with melted chocolate and more sunbutter if you'd like. I microwave my chocolate and peanut butter in separate bowls for about 30 seconds each to melt. Give it a good stir, and heat it for a few more seconds if it's not melted and thin enough to drizzle. Let the chocolate and peanut butter harden before cutting or storing.