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 shrimp, pat dry and season with a pinch of salt and pepper. Heat 1 tsp. olive oil in a large non-stick pan over medium-high heat. Add shrimp to hot pan and cook undisturbed until seared on one side, 2-3 minutes. Flip, and cook until shrimp reaches a minimum internal temperature of 145 degrees, 1-2 minutes..
If using roasted chicken breast, remove from packaging and microwave until warm, 1-2 minutes.