You can freeze the cookie dough balls but not the baked cookies. They would become too brittle as they thaw. To freeze the cookie dough, scoop it onto a parchment-lined baking sheet as described above and freeze the cookies. Once they are completely hardened, transfer them to an air-tight freezer bag or freezer-safe container and store them in the freezer for up to 3 months. To bake the cookie, you don't have to thaw them. Simply bake them for an extra 2 or 3 minutes.