Add cute, festive style to your mug collection with the 16-Ounce Christmas Stoneware Official Cookie Tester Mug from Wondershop. This white mug features the phrase official cookie tester with an allover print of snowflakes, gingerbread men, wreaths and more for an amazingly festive look. This stoneware mug is suitable for hot or cold beverages, and its also dishwasher and microwave safe for quick cleaning and reheating. Welcome to the Wondershop.