Chain: Pizza Hut
Introduced: 1995 

Another brainchild of fast-food savant Tom Ryan, the stuffed crust pizza addressed the American people's desire for both a cheesier pizza and their distaste for crust. According to Ryan, it took Pizza Hut a year-and-a-half to perfect the science behind the product, but it's evident that the hard work paid off. Once you try it, you can't go back to eating plain crust, like some kind of pizza peasant.