Think you've got the ultimate game-day treat? No way! These pizza-stuffed burgers are the greatest mouthful of food ever, and you won't believe how easy they are to make! An Italian spiced burger mix is stuffed with fresh mozzarella and chopped pepperoni, then browned in butter and baked to perfection. If you like the heat, add red pepper flakes. If you don't, feel free to leave them out!