Directions

Preheat oven to 350°. In a large saucepan melt butter over medium heat; add onion. Cook and stir until tender, 4-6 minutes. Add garlic; cook 1 minute longer. Stir in flour and salt until blended. Gradually whisk in milk. Bring to a boil; cook and stir until thickened, about 1 minute. Stir in 2 cups mozzarella cheese, 1/2 cup Parmesan cheese, basil, oregano and pepper; set aside.
In a large bowl, combine ricotta cheese, parsley and remaining 2 cups mozzarella; set aside. Spread about 1-1/2 cup cheese sauce into a greased 13×9-in. baking dish; top with 3 noodles and half of each of the following: ricotta mixture, pesto and spinach. Repeat layers. Top with remaining noodles and cheese sauce. Sprinkle with remaining 1/2 cup Parmesan.
Bake, uncovered, until heated through and cheese is melted and sauce is bubbly, 35-40 minutes. Let stand 15 minutes before serving.