For rounder cookies, gently press extra white chocolate chips and pistachios onto the tops before baking. If your kitchen is warm, chill the scooped dough for 15 to 20 minutes for thicker cookies. Store airtight at room temperature up to 4 days or freeze baked cookies for up to 2 months. Dough balls can be frozen on a sheet pan, then bagged and baked from frozen (add 1 to 2 minutes).