Spaghetti with Zesty Bolognese

"I don't usually like spaghetti, but I love this recipe... leave it to me to find a way to make spaghetti fattening!"
-Liz Benedict

Ingredients:
1 onion, small
1/4 C Zesty Italian dressing
1 lb ground beef
1 (15 oz) can tomato sauce
1 (14 oz) can diced tomatoes, undrained
4 oz cream cheese
12 oz spaghetti
1/4 C Parmesan cheese, grated

Directions:
Cook onions in dressing in large skillet on med heat. Increase heat to medium high heat. Add meat; cook, stirring frequently, until browned. Stir in tomato sauce and tomatoes. Bring to a boil. Reduce heat to medium low. Simmer 15 min. Remove from heat. Stir in cream cheese until well blended. Meanwhile, cook pasta. Spoon sauce over pasta. Sprinkle with Parmesan cheese.