1. Preheat the oven to 375 degrees.

2. Heat the olive oil in a large skillet over medium-high heat. Add the mushrooms and thyme and season with salt. Cook until softened, about 10 to 12 minutes.

3. In a medium bowl, combine the ricotta, milk and eggs, and stir. Add 1 cup of mozzarella, Parmesan, spinach, basil and oregano; season with salt and pepper and stir to incorporate.

4. Spread 1 cup of tomato sauce in the bottom of a 9-x-13-x-2-inch pan. Layer 4 sheets of lasagna on top, slightly overlapping. Spread half the ricotta mixture on the noodles, and cover with half the mushroom mixture. Top with 1 1/2 cups tomato sauce. Repeat with 4 sheets of lasagna pasta, remaining ricotta mixture, remaining mushrooms and 1 1/2 cups tomato sauce. Cover with the remaining 4 sheets of lasagna, the remaining cup of tomato sauce and the remaining mozzarella cheese.

5. Lightly coat a sheet of aluminum foil with nonstick spray and cover the uncooked lasagna, spray-side down. Bake at 375 degrees, covered, until bubbly, about 45 minutes. Remove foil from lasagna and increase the oven temperature to 450 degrees. Cook until cheese browns, about 12 minutes. Remove from the oven and let stand for 15 minutes before cutting. Serve warm and garnish with basil.