Preheat oven to 350°. Cook pasta according to package directions to al dente., Meanwhile, in a Dutch oven, saute chicken in 1 tablespoon oil until juices run clear. Remove with a slotted spoon and set aside. In same pan, saute onions and peppers in remaining oil until tender. Add broth, soups, milk, Cajun seasoning and garlic powder. Bring to a boil; remove from heat., Drain pasta. Add pasta and chicken to soup mixture; toss to coat. Divide between two greased 13x9-in. baking dishes. Sprinkle with cheese. Cover and bake casseroles 20-25 minutes or until bubbly.