Cook mostaccioli according to package ... until tender. Add chicken; cook just until chicken ... stirring occasionally. Combine pasta, spinach, chicken mixture, and ... degrees for 20 minutes.
Preheat oven to 350. In ... set aside. Brown chicken on both sides, cook 30 ... 10 minutes. Place pasta in 13x9x2 inch baking pan, ... minutes or until bubbly.
Saute onion and garlic until clear. Season chicken with salt and pepper. Cut ... Serve over cooked pasta and sprinkle with grated fresh Parmesan cheese.