I saw this on Diners Drive-Inns and Dives a long time ago and it has become my favorite way to use leftover Chili.
Made a kicked up Carol Shelby the other day so here it is.
A two way is simply Spaghetti and a ladel of Chili
For a Three way you add a mound
To complete the four way you add onions
A five way adds beans on top of the onions.
Thanks for looking.