Slow Cooker Sausage Lasagna

Name: Slow-Cooker Sausage Lasagna
Ingredients: 1 pound Italian pork sausage, casings removed; 1 pound ground beef sirloin; 1 medium onion, finely chopped; 2 medium carrots, finely chopped; 2 garlic cloves, minced; Coarse salt and ground pepper; 1 can (6 ounces) tomato paste; 1 can (28 ounces) crushed tomatoes in puree; 9 lasagna noodles; 2 cups shredded part-skim mozzarella (8 ounces)