Preheat you oven to 350F. Spray your casserole dish with cooking spray and set aside.
In hot boiling water with a heavy pinch of salt, make your macaroni according to the package directions until al dente. About 7-10 minutes. Drain out the water and add the macaroni back into the pot.
Stir in the chili and cheese until evenly distributed. Leave a little cheese (about 1/4 cup) for the topping.
Dump your mixture into your casserole dish and sprinkle the remainder of your cheese on top.
Bake at 350F for 25-30 minutes until it's hot and the cheese is melted.