Transfer to a shallow pan (such as 8x8 or loaf pan) lined with parchment or plastic wrap and top with another piece of plastic wrap and use your hands to form the mixture into a tight square (keeping in mind you want them about 1/2 thick and you'll cut them into 10-12 bars // amount as original recipe is written) with a uniformly flat top. This will take a little work but the warmth of your hands will work well to shape them.
Still covered, pop them into the freezer to set for 15 minutes. Remove and cut into 10 bars (as original recipe is written // adjust if altering batch size). Store in an airtight container or bag in the fridge to keep fresh, or in the freezer for longer term storage.
*Nutrition information is a rough estimate.