Pre-heat oven to 325. Coat a 9x13 baking pan with cooking spray.
Cook noodles according to package instructions . Drain and rinse with cool water. You can also use the noodles that do not require any pre-boiling!
While noodles are cooking, combine sauce, lemon juice, spinach, and red peppers (and if desired, shredded chicken).
Arrange 3 cooked noodles in the pan. Top with 1/3 spinach mixture. Repeat two more times.
Cover with foil and bake for 45 minutes.
Uncover, sprinkle with cheese, and bake uncovered until cheese is melted.
Let dish stand for 5 minutes before serving.