Impossible Cheesy Mac Pie

Preheat oven to 400 degrees F. Grease 10" pie pan with solid shortening; sprinkle with flour and set aside. Bring a medium pot of water to a boil. Cook the macaroni half of the recommended cooking time, drain well and rinse with cold water; drain well again. In medium bowl, combine cooled macaroni, American cheese, Cheddar cheese, colby cheese and uncooked macaroni. In large bowl, combine remaining ingredients except peas and Parmesan cheese and mix well until combined. Stir in macaroni mixture and peas. Pour into pie pan, making sure that macaroni is below the surface of the batter. Sprinkle with Parmesan cheese and bake at 400 degrees F for 35-40 minutes until pie is puffed and macaroni is tender when pierced with a fork. Serves 6