Cook macaroni according to package directions, omitting salt and fat; drain. Sprinkle chicken with 1/4 teaspoon kosher salt and 1/8 teaspoon freshly ground black pepper. Heat a large Dutch oven over medium-high heat. Add olive oil to pan; swirl to coat. Add chicken to pan; sauté 3 minutes. Stir in chili powder, cumin, and minced garlic; cook 1 minute, stirring frequently. Add diced tomatoes and diced green chiles. Bring to a boil, and cook for 2 minutes. Combine milk and flour in a small bowl, stirring with a whisk. Gradually add milk mixture to pan, and cook 3 minutes or until slightly thickened, stirring frequently. Stir in cheese. Stir in macaroni, 1/4 teaspoon kosher salt, and 1/8 teaspoon black pepper. Cook 1 minute or until thoroughly heated.