For many, Thanksgiving dinner isn’t complete without a serving of sweet potato casserole aka candied yams. But many don’t know how the sweet and sticky recipe came to be. According to Munchies, a corporation came up with the sweet potato side dish in an attempt to mass-market marshmallows—which had just been introduced—and convince Americans to accept the light and fluffy treats. Apparently it worked, and marshmallow-topped yams is now a Thanksgiving staple. Read more about its history on Munchies.