Add the onion, green pepper and celery to the macaroni; stir. Add one-half of the cheese and stir over low heat until melted. Season and stir in evaporated milk. Spoon into a well-greased 8x8x2 baking pan and sprinkle remaining cheese evenly on top. Bake in a pre-heated oven at 180ºC or 20 minutes. Let stand for 10 minutes and cut into squares to serve.
Yeild:4-6 servings.