Prep Time: 30
Cook Time: 60
Serves: Serves: 8
Combine Ricotta cheese, eggs, spinach, salt, pepper, nutmeg and Italian seasoning in small bowl; set aside.
Cook mushroom slices in nonstick pan coated with cooking spray over medium-low heat 5 minutes or until softened and lightly browned.
Spoon 1-1/2 cups sauce into 13x9-inch baking dish; top with half of lasagna noodles and Ricotta mixture. Top with mushrooms and 1 cup Mozzarella cheese, then remaining noodles. Top with remaining sauce, remaining Mozzarella cheese, Provolone cheese and Parmesan cheese.
Cover with foil. Bake in preheated 350°F oven 45 minutes. Remove foil; bake 15 minutes more or until cheese is lightly browned. Let stand 15 minutes before serving.