Preheat oven to 350°

In a large skillet, cook beef and onion over medium heat until beef is no longer pink and onion is tender; drain and return to skillet. Add the water, tomato paste, salt and garlic powder to beef. Bring to a boil then reduce heat; cover and simmer 5-7 minutes or until heated through.

In a small saucepan, melt cream cheese over low heat stirring constantly. Gradually stir in milk and Parmesan cheese until blended and smooth.

Place cooked noodles in a greased 13x9 inch baking dish. Spread meat sauce evenly over noodles. Spoon cream cheese mixture evenly over meat sauce. Bake uncovered at 350° for 30 minutes or until heated through.