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.

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.

Four expert cookie makers are looking to scare the pants off of hosts Duff Goldman and Rosanna Pansino by making cookies showing three levels of a haunted house! Then, the three remaining cookiers host a séance by making playable spirit boards. To make sure there is maximum "spirit" in their boards, they will include spirits like apple brandy, cinnamon whiskey, coffee rum and black currant liquor. Only one cookie maker will spirit away with the $10,000 prize.

Four expert cookie makers turn the tables and show hosts Duff Goldman and Rosanna Pansino what would happen if our favorite Halloween treats wanted to eat us. After one baker is eliminated, the cookie makers reveal their talents by making two-sided trick-or-treat bags, with on side being light and fun while the other is dark and spooky. Naturally, a trick-or-treat bag is filled with candy, so these bags must be made with sour lemon candy, black licorice, cinnamon candy or peach rings. One trick-or-treater will walk away with an extra-sweet $10,000.

Four cookie masters try out a hot Halloween trend by decorating half-face makeup cookies! One half of their face cookies are a self-portrait, while the other half will show off their scary makeup. After hosts Duff Goldman and Rosanna Pansino decide who will move on to round two, the remaining cookiers take Halloween gore to a new level by making life-size oozing zombie parts out of cookies! To ensure their zombie parts overflow with goo, they'll need to use oozing ingredients like blackberry jam, orange marmalade, raspberry jam and cranberry sauce. One cookier will take home a $10,000 prize!

It's the day after Halloween, and all the spooks are exhausted from their night of hard work. Four talented cookie makers show hosts Duff Goldman and Rosanna Pansino how the creepers relax the next day. The three cookiers who advance to the second round try to bury the competition while making 3D ancient coffins. To give their ancient coffins an "authentic" flavor, they'll need to use "mummified" ingredients like dried figs, dates, dried apples and dried cherries. One winner will take home the $10,000 prize.