If using chicken, pat dry and cut into 1" dice. Season with a pinch of salt and pepper. Place a medium non-stick pan over medium-high heat and add 2 tsp. olive oil. Add chicken to hot pan and stir occasionally until chicken browns and reaches a minimum internal temperature of 165 degrees, 5-7 minutes.
If using salmon, pat dry and season flesh side with a pinch of salt and pepper. Place a medium non-stick pan over medium heat and add 2 tsp. olive oil. Add salmon, skin side up, to hot pan and sear until golden brown and salmon reaches a minimum internal temperature of 145 degrees, 4-6 minutes per side. Flake at the end.
If using roasted chicken breast, remove from packaging and microwave until warm, 1-2 minutes.