Place all ingredients in a food processor or high speed blender and process until combined and thick (do not blend too much). Alternatively - mix all ingredients well in a large bowl.
Transfer the mixture to the prepared pan. Use a spoon to spread the mixture evenly across - and pack it down using the bottom of a flat round surface (like a drinking glass... or your hands).
Cover the pan and refrigerate for at least one hour, or overnight. This gives the oats time to absorb moisture so the granola bars can set.
When you’re ready to slice, lift the bars out of the pan by grabbing both pieces of parchment paper on opposite corners. Use a sharp knife to slice the mixture into 14 bars.
For portability, you can wrap individual bars in plastic wrap or parchment paper.