Preheat oven to 160c
In a bowl mix together all the ingredients (if your peanut butter is quite hard you may want to heat it up with the maple syrup so it becomes pourable and easier to mix)
Make sure the mixture holds together, if not you can add a splash of oil
Then press the mixture into a prepared baking dish. You must make sure it's really pressed into the dish
Bake for 20-25 minutes
Slice into bars once completed cooled