Pesto Lasagna with Spinach and Mushrooms

From: lordthompsonbride

Just made this over the weekend, and it's one of the best lasagnas I've ever had!! It's on the lighter side, too.

4 cups torn spinach
2 cups sliced cremini mushrooms
1/2 cup commercial pesto
3/4 cup (3 ounces) shredded part-skim mozzarella cheese
3/4 cup (3 ounces) shredded provolone cheese
1 (15-ounce) carton fat-free ricotta cheese
1 large egg, lightly beaten
3/4 cup (3 ounces) grated fresh Parmesan cheese, divided
1 (25.5-ounce) bottle fat-free tomato-basil pasta sauce
1 (8-ounce) can tomato sauce
Cooking spray
1 (8-ounce) package precooked lasagna noodles (12 noodles)

Preheat oven to 350 degrees.

Arrange the spinach in a vegetable steamer; steam, covered, 3 minutes or until spinach wilts. Drain, squeeze dry, and coarsely chop. Combine spinach, mushrooms, and pesto in a medium bowl, stirring to combine; set aside.

Combine mozzarella, provolone, ricotta, and beaten egg in a medium bowl, stirring well to combine. Stir in 1/4 cup Parmesan, and set aside. Combine the pasta sauce and the tomato sauce in a medium bowl.

Spread 1 cup pasta sauce mixture in the bottom of a 9x13" baking dish coated with cooking spray. Arrange 3 noodles over pasta sauce mixture; top with 1 cup cheese mixture and 1 cup spinach mixture. Repeat the layers, ending with spinach mixture. Arrange 3 noodles over spinach mixture; top with remaining 1 cup cheese mixture and 1 cup pasta sauce mixture. Place remaining 3 noodles over sauce mixture; spread remaining sauce mixture over noodles. Sprinkle with the remaining 1/2 cup Parmesan. Cover with aluminum foil; bake covered 45 minutes. Uncover, bake an additional 15 minutes uncovered. Let cool for a few minutes before serving.