Preheat the oven to (350°F) = (176°C) degrees.
Brown the ground beef with the chopped onion, and drain the grease, if any. Set this aside.
Grease a casserole dish, and place a layer of Frito's at the bottom.
Next, add a layer of ground beef and onion on top of the Frito's.
Spread a layer of chili con carne as the third layer.
The fourth layer is the chili with beans, olives, and grated cheese.
Finish the casserole with a thin layer of Frito's and grated cheese.
Bake for 30 minutes or until cooked through.