If using roasted chicken breast, remove from packaging and microwave until warm, 1-2 minutes. Add to salad and combine.
If using chicken breasts, pat dry, and season both sides with a pinch of salt and pepper. Place a medium non-stick pan over medium heat and add 1 tsp. olive oil. Cook until chicken reaches a minimum internal temperature of 165 degrees, 5-7 minutes per side. Slice and add to salad.