Preheat oven to 375°. Melt Spread in 12-inch skillet over medium heat and cook onion and mushrooms, stirring occasionally, 8 minutes or until onion is tender; set aside.
Combine cheeses, eggs, prosciutto and nutmeg in large bowl. Stir in onion mixture. Equally spread cheese filling on each lasagna noodle; roll up and set aside.
Combine Sauces in medium bowl. Spread 1 cup sauce mixture in 13 x 9-inch baking dish. Arrange lasagna rolls seam side down in dish. Evenly pour 1 cup sauce over lasagna rolls. Cover with aluminum foil and bake 30 minutes or until heated through. Serve with remaining sauce, heated.