This Mac 'N Cheese Puff is slightly different than other baked mac and cheese. Its a perfect dish for picky kids, or for hungry adults! This can be a side dish or stand on its own as a main course.
Cook macaroni in salted, boiling water according to package directions or until al dente. In saucepan, combine egg yolks, milk, butter, mustard, onion, 1/2t salt and a dash of pepper. Add cheese.
Cook and stir over medium heat about 10 minutes or until mixture thickens slightly (do not boil). Stir in macaroni. Fold in egg whites.
Pour half of the mixture into a square 8×8 casserole dish. Place half of the franks into the dish and pour the remaining mixture. Place the remaining franks on top. Bake in a 350 degree oven until lightly browned on top (35-40 minutes). Garnish with parsley if desired.