Edible stained glass is one of the most colorful and bewitching trends in the cookie world, and four cookie experts make glowing Halloween stained glass cookies for hosts Duff Goldman and Rosanna Pansino. After one cookier is eliminated, the remaining three masters build giant, elaborate Halloween funhouses that would thrill any Halloween carnival-goer. The judges will really feel like they are at a carnival as the bakers must incorporate fun fair flavors like caramel apples, grilled corn, popcorn balls and deep-fried sandwich cookies. One talented contestant will take home a sweet $10,000 prize.

Today in the laboratory, four top cookie makers take on one of the hardest technical challenges in the cookie world -- slice and bake cookies! Then, hosts Duff Goldman and Rosanna Pansino reflect on the remaining three cookie makers' creepy 3D haunted mirrors -- each with something spooky trapped inside! Old, haunted mirrors are always cracked, so the cookiers will have to incorporate "cracking" ingredients like kettle chips, pretzels, corn chips and plantain chips. The best mirror-maker will make off with a crackling $10,000.