Thanks! I just looked this up and it's in the info section on the same recipe

"Can you freeze peanut butter cookies?
You can freeze the baked cookies for up to 3 months. Place them on a baking sheet in the freezer until they are completely frozen. Then transfer them to freezer bags or an airtight container. To reheat the frozen cookies, bake in a 350°F oven for 5 minutes, or until until warmed through.

Or, you can make the peanut butter cookie dough ahead of time, wrap tightly in plastic wrap, and freeze. When ready to bake, allow the dough to thaw in the fridge until you’re ready to form and bake the cookies."