Spinach Alfredo Lasagna

12 oz. lasagna noodles
1 pound bulk pork sausage
1 package (10 oz.) frozen chopped spinach, thawed and well drained
1 jar (17 oz.) Alfredo sauce
1/2 tsp. salt
1/4 tsp. pepper
1 egg
2 cups (8 oz.) shredded cheddar cheese
1 carton (15 oz.) ricotta cheese
1/2 cup grated Parmesan cheese
1 cup (4 oz) shredded mozzarella cheese

Soak the noodles in hot water for 15 minutes. Mean while, in a skillet, brown the sausage. Drain noodles; set aside. Drain sausage; add spinach, Alfredo sausce, salt and pepper. In a bowl, combine the egg and cheddar, ricotta and Parmesan cheeses: mix well. In an ungreased 13-in.x 9-in.x 2-in. baking dish, layer a third of the sausage mixture, noodles and cheese mixture. Repeat layers twice. Sprinkle with mozzarella cheese. Cover and bake at 350 F for 45 minutes. Let stand for 15 minutes before cutting.