Heat oven to 375°F.

Prepare pasta according to package directions; drain.

Meanwhile, in medium bowl, stir together cheeses, eggs, parsley, salt, pepper and nutmeg.

In 13 x 9 x 2-inch baking dish, spread 1/2 cup pasta sauce.

Fill each cooked shell with about 1-1/2 level tablespoons cheese mixture; layer one-half filled shells in-prepared dish.

Spread one-half remaining sauce over shells; layer remaining filled shells over sauce.

Spread remaining sauce over shells; sprinkle with additional Parmesan cheese, if desired.

Cover with foil; bake 35 minutes or until hot and bubbly (doubling recipe or more may require increased baking time).