Preheat oven to 350 degrees.
Bring a pot of water to a boil. Add teaspoon of salt and cook lasagna noodles according to package directions. Drain and lay noodles down on baking sheet.
SautÃ© minced garlic and onion in olive oil. Add spicy Italian sausage and cook thoroughly. Stir in sauce and heat until warm.
In a medium bowl combine ricotta cheese, Parmesan cheese, 1 cup mozzarella cheese, egg, garlic, spinach, salt and pepper.
Spray 9x13 baking dish with cooking spray and add a thin layer of sauce to the bottom.
Spread ricotta cheese mixture evenly onto each lasagna noodle. Top with a layer of the Italian sausage sauce and sprinkle mozzarella cheese on top. Roll the noodles up and place into prepared pan. Top the lasagna noodles with the remaining sauce and sprinkle mozzarella cheese on top. Cover with foil and bake for 30 minutes. Remove foil and bake for an additional 5 minutes.