Preheat oven at 350. Prepare a 13 x 9" pan with cooking spray. Cook, pasta shells according to package directions. In a skillet, cook chicken, over medium high heat until no pink remains. Drain fat. Reduce heat to medium low. Add cream cheese and taco seasoning; simmer until cheese melts. Fill shells with meat mixture. Arrange shells in prepared pan. Pour taco sauce over each shell. Then, top with cheeses and chips. Cover with foil. Bake 15 minutes more or until bubbly.