Italian Sausage Lasagna

This is good. Love the fresh spinach. Always looking for a new way to make lasagna, and this is worth it!

1 pkg (16oz) ground mild italian sausage
12 lasagna noodles
1 onion, chopped
2 cloves garlic, minced
1/2 cup parmesan
2 packed cups fresh spinach, chopped
2 cups or more grated mozzarella
1 egg
4 cups ricotta cheese
24oz jar prego sauce (marinara or traditional) or homemade if you are so blessed
dried Oregano
In large pot of water boil noodles till al dente, about half the time on box. In skillet, cook sausage and onion till no longer pink. Add garlic, cook 1 minute. Add spaghetti sauce, and set aside. In bowl mix spinach, egg, ricotta and half the parmesan. Coat a 9x13 baking dish with oil spray. Spread bottom with 1 cup of meat sauce. layer on 3 noodles. Spread about 1/3 of the ricotta mixture on noddles, then 1/3 meat sauce. Sprinkle a handful of mozzarella over. Then 3 noodles. Repeat till 3 layers are made, ending with 3 noodles on top. Sprinkle top with remaining mozzarella and parmesan. Sprinkle generously with dried oregano. Bake uncovered at 350 for 45 minutes till browned and bubbly.