Cook and drain macaroni (do not overcook). Transfer to a large bowl, and add ingredients mixing each ingredient in slowly (including 3⁄4 cheese). Mix everything together with a spoon. Place macaroni into a pyrex dish using the 1⁄4 grated cheese on top as a crust. Place in oven at 350°F. The Pie is finished when the top cheese starts to look slightly brown.
Photo originally from travellingfoodie2006.com