Is that recipe title long enough for you?
I got this recipe from the Kraft Foods magazine that I used to receive in the mail... until I moved and I couldn't get the subscription changed over for some reason...Sad.
This recipe makes 4 servings and each serving is only 460 calories! This was delicious- especially for being under 500 calories!
Ingredients:
1 1/2 cups multigrain penne pasta, uncooked
9 oz. fresh spinach leaves
1 lb. boneless skinless chicken breasts, cut into bite size pieces
1 tsp dried basil
1 jar (14 1/2 oz.) spaghetti sauce
1 can (14 1/2 oz) diced tomatoes, drained
2 oz. Neufchatel cheese, cubed (you could use cream cheese if you aren't worried about the calorie content)
1 cup Mozzarella Cheese
2 Tbsp. Parmesan Cheese

Right after I took the picture of my ingredients, my little cheese-monger stole a whole bunch of cheese and I had to grate more.

Heat oven to 375. Cook and stir chicken and basil in large skillet. Add sauce and tomatoes; bring to boil. Simmer 3 minutes or until chicken is completely cooked. Stir in Neufchatel cheese.

Cook pasta according to package directions

Add the spinach to the boiling water for last 1 minute. Remember that spinach will boil down to almost nothing when you put it in the water, so put in WAY more spinach than you think you should... TRUST ME!

Drain pasta mixture and add to skillet of chicken, tomatoes and sauce. Add 1/2 cup mozzarella cheese and stir until mixed well.

Transfer to a baking dish. I used an 8x8 pan. Bake 20 minutes. Sprinkle with remaining 1/2 cup mozzarella cheese and 2 Tbsp. Parmesan cheese. Bake 3 more minutes.

You could easily make this vegetarian by just leaving out the chicken and it would still be delicious! Enjoy!
(Picture from Kraft Foods magazine, pg. 22 Holiday '08/Winter '09 Magazine)