You can’t argue with success, and any way we measure it, this is the recipe that topped the charts in 2015. From the four (yes, four!) kinds of cheese, to the easy 20-minute prep time and the convenience of a casserole, our Million-Dollar Spaghetti Casserole had all the makings of a winner right from the start. If you haven’t made it yet, what are you waiting for? Fire up the oven!