No need to cook the lasagna noodles...just layer them right in the pan with the cheeses, spinach and tomato-mushroom sauce.
Set the oven to 400°F. Stir the ricotta cheese, spinach, 1 cup mozzarella cheese and the Parmesan cheese in a large bowl. Season with salt and pepper.
Spread 1 cup sauce in an 11x8x2-inch baking dish. Top with 3 lasagna noodles and half the spinach mixture. Repeat the layers. Top with the remaining sauce. Cover the baking dish.
Bake for 40 minutes. Uncover the dish. Sprinkle with the remaining mozzarella cheese. Bake for 10 minutes or until hot. Let stand for 20 minutes before serving.
This nutritional information refers to each serving of the entire recipe and not just the products used as ingredients.