Prepare noodles according to package instructions. Coat interior of casserole dish with olive oil or spray. Fill prepared dish nearly 3/4 of the way full with noodles. DO NOT overfill dish. Spoon a small portion of the sauce over the noodles. Lay a layer of single layer of muskie fillets on noodles and sauce. Spoon enough additional sauce over muskie to just cover it.
If you are using the microwave, add cheese now in a thick layer on top of the muskie. Cover and cook until the muskie flakes easily with a fork. If you are using a regular oven, preheat oven to 375 degrees F. Do not add cheese layer before cooking. Bake muskie, sauce, and noodles in covered dish (allowing 6 minutes per 1/2 inch of thickness of fillets) until muskie flakes easily with a fork. When fish is done, remove lid from dish and add the cheese in a thick layer over the fish. Return to oven. Cook uncovered until the cheese is just starting to brown.