Preheat oven to 350. Line a 9x13 pan with parchment paper and set aside.
In a bowl microwave peanut butter, honey and vanilla for 30 seconds.
In another bowl mash bananas with a fork.
Combine bananas and peanut butter mixture and stir, then add in the brown sugar and stir.
Next, add in the remaining ingredients and stir to combine, it may be a little hard to stir. I like to fold the ingredients together (folding under and over with a spatula).
When everything is mixed together spread it into the prepared baking dish and flatten the top so that it is even.
Bake for 20 minutes, or until edges are golden brown, you may need to bake for a few more minutes (I've had to bake these all the way up to 30 minutes one time).
Remove from oven and allow to cool completely, then, using a sharp knife cut into 20 bars.
These granola bars store really well in the freezer. Simply individually wrap them in plastic wrap and put in a freezer bag and remove when ready to enjoy, or store in an air tight container in the fridge.