Drizzle olive oil into a skillet over medium heat. Add chicken strips to the skillet and sprinkle with half of the taco seasoning. Cook until cooked throughout, about 5-10 minutes. Remove chicken from skillet and into a bowl. Set aside. Add onions and peppers to skillet, sprinkle with remaining taco seasoning and cook until slightly tender, about 3 minutes. Remove from skillet and add to the bowl along with the chicken. Turn off the heat to the skillet.