Cut chicken thighs into narrow strips. Heat oil in large skillet and saut� chicken 5 minutes, mix in onion, celery, bean sprouts, salt, pepper, soy sauce and sugar. Cover and cook over low heat 8 minutes. Don't overcook. Mix together the cornstarch and broth. Stir into skillet until thickened. Add noodles and stir. Cook 2 minutes only.