Spinach Ziti

1 pkg. (16 oz.) ziti pasta
1 jar (14-16 oz.) chunky-style pasta sauce
16 oz. ricotta cheese
16 oz. mozzarella cheese, shredded & divided
10 oz. pkg. frozen chopped spinach, thawed and squeezed dry
1/4 tsp. black pepper (to taste)

Prepare pasta according to package directions and drain well. Preheat oven to 350. Spray 13"x9" pan with cooking spray. Combine cooked pasta, sauce, spinach, ricotta and 3/4 of the mozzarella cheese. Pour mixture into prepared baking pan. Cover with aluminum foil and bake for 20 minutes. Sprinkle with remaining mozzarella cheese. Bake uncovered 10 minutes or heated through.