Empty the mixture into the pan and using a spatula spread it out and press down firm. I actually took a 2nd piece of parchment paper and laid that on top then used the bottom of a measuring cup to compact it.
Cover with plastic wrap and chill for at least one hour.
Remove from the fridge, cut into bars and store in an air tight container in the fridge.
Notes
Place 1 1/2 cup old fashioned oats in the food processor and pulse/pulverize until you have a powder. This will make 1 cup oat flour