Bring a large pot of lightly salted water to a boil. Add egg noodles and cook for 8 to 10 minutes or until al dente; drain.

Preheat oven to 400 degrees F.

Toss drained noodles with 2 teaspoons of the oil.

Heat remaining oil in a skillet and saute onion over medium heat until soft.

Combine noodles, onion, ham, Swiss cheese, salt and pepper.

Transfer to a greased 3 quart casserole dish.

In a bowl mix together egg and milk; pour over noodle mixture.

Sprinkle with parmesan cheese.

Bake in a preheated oven for 30 minutes.