Many peanut butter cookie recipes require you to chill the dough for 30 minutes in the refrigerator before baking. This helps to prevent the cookies from spreading out too much in the oven. This step isn’t necessary for this recipe, so feel free to form your cookies as soon as the dough is ready and bake them up right away!  Having said that, if you get called away while making them, the dough will keep in the fridge whether rolled or still in the bowl, until you get back. Just let it warm up a little at room temperature for a bit so it softens enough to roll and flatten them with ease. If already shaped and on the tray you can bake right from the fridge.