Combine ricotta, 1 cup mozzarella, 1/4 cup parmesan, eggs, spinach and Lipton® Recipe Secrets® Vegetable Soup Mix in medium bowl; set aside.
Spread 1 cup Pasta Sauce in 6-quart slow cooker. Layer in 4 lasagna noodles, broken to fit, then 1 cup Pasta Sauce and 1/2 of the ricotta mixture; repeat. Top with remaining 4 lasagna noodles and 2 cups Pasta Sauce. Reserve remaining Pasta Sauce. Cook covered on LOW 5 to 6 hours.
Sprinkle with remaining cheeses. Cover and cook an additional 10 minutes. Let stand 10 minutes before serving. Serve with remaining Pasta Sauce, heated.