Prepare lasagna according to package directions. Drain and rinse in cold water; drain well.
In a large skillet, heat olive oil over medium-high heat and sauté garlic, onion, carrots, celery and mushrooms until tender, about 5 minutes; remove from heat.
Using the same skillet on medium heat, brown hamburger and Italian sausage, season with salt and pepper, stirring and crumbling meats. Cook about 10 minutes or until no longer pink. Drain juices. Mix in vegetable mixture.
Preheat oven to 375 degrees F.
Spray 13x9x3 baking dish with non-stick cooking spray.
Spread 1 cup of marinara sauce on bottom of baking dish.
Layer 3 lasagna noodles, 1/3 of ricotta cheese, 1/2 of the meat mixture, 1 cup marinara sauce, 1 cup mozzarella cheese.