Press cookie dough evenly in the bottom of an ungreased 12-inch pizza pan or a 13x9x2-inch baking pan. (Dough will barely cover the pan.) Break Thin Mints into halves or thirds; press cookie pieces into dough, covering evenly. Bake at 350 degrees for 12 to 18 minutes or until golden brown. Place white chocolate morsels into a small self-closing bag. Microwave the bag of morsels on MEDIUM HIGH (70% power) for 40 to 50 seconds or until melted. Snip one corner (about 1/8 inch) off the bottom of the bag. Hold bag tightly at top and drizzle white chocolate stripes over top of pizza. When cool, cut pizza into 8 or 10 wedges. If desired, top each serving with a scoop of ice cream.
Source: ABC Bakers