Back-to-school season isn't just for kids! The Kitchen hosts are teaching new recipes and techniques, starting with Jeff Mauro's lesson on classic Chicken Marsala. Alex Guarnaschelli leads Salad School and shows off her viral 3-2-1-1 Vinaigrette. Katie Lee Biegel shares easy ways to showcase kids' school projects and makes Zoo Mix for an after-school snack. Geoffrey Zakarian wows with his Ricotta Gnudi with Browned Butter. The one and only Bobby Flay stops by to chat and gets challenged to a spelling bee, and Sunny Anderson rings in recess with her 1-2-3 Milkshake.