Brown beef in large skillet until no longer pink, stirring occasionally to break up beef; drain. Stir in 1 cup spaghetti sauce; set aside remaining sauce. In a medium-sized bowl, mix ricotta cheese, spinach, mozzarella cheese, 3 tbsp Parmesan cheese and egg. On each lasagna noodle, spread about 1/4 cup ricotta mixture. Top with about 1/3 cup beef mixture. Roll up each noodle from short end; lay each roll, seam side down, in lightly greased 13"x 9"x 2" baking dish. Pour reserved spaghetti sauce mixture over noodles. Sprinkle with remaining Parmesan cheese and parsley. Bake, covered, at 350°F for 30 minutes. Uncover and bake 15-20 minutes more, or until hot and bubbly. Serve with additional Parmesan cheese and/or other garnish if desired. Makes 6 servings.