Spinach and Mushroom Veggie Lasagna

Name: Spinach and Mushroom Veggie Lasagna
Ingredients: 2 tablespoons olive oil; 1 1/2 pounds cremini and/or shiitake mushrooms; 1 teaspoon dried thyme; Kosher salt; 1 15-oz container part-skim ricotta; 3/4 cup skim milk; 2 eggs; 3 cups part-skim mozzarella cheese; 3/4 cup grated; 1 10-oz box frozen chopped spinach; 1/3 cup fresh basil; 1 teaspoon dried oregano; Freshly ground black pepper; 5 cups tomato sauce; 12 sheets no-cook lasagna noodles; Nonstick cooking spray