Bring a small saucepan of lightly salted water to a boil. Add macaroni and cook until almost tender, about 6 minutes. Drain and set aside.
Crumble the turkey in a large skillet set over medium heat. Cook and stir until evenly brown; drain. Add onion to browned turkey meat and cook until onion is tender, about 5 minutes. Stir in tomatoes, gravy mix and chili powder until combined then mix in the corn and macaroni. Cover; reduce heat to low and simmer, for 10 minutes, stirring occasionally.
Serve on a bed of tortilla chips topped with shredded lettuce and sour cream.
