In a large skillet heat olive oil over medium-high heat; add chicken. Cook and stir for 3 minutes, or until chicken is lightly browned. Add onion and garlic;
cook and stir 2 minutes. Add bell pepper, celery, chili powder, tomatoes and chicken broth; bring to a boil. Add pasta and cook, stirring occasionally, for 15 minutes or until pasta is cooked. Serves 4.