Brush oil on chicken breasts; sprinkle with 2 tablespoons of the seasoning mix (from dinner kit), and coat on all sides. Place chicken on direct heat of grill over medium heat. Cover grill; cook 12 to 15 minutes, turning occasionally, until juice of chicken is clear when center of thickest part is cut (165°F). Brush chicken with 2 tablespoons of taco sauce (from dinner kit) during last 2 minutes of cooking. Remove from grill, and cut into cubes.