If using whole chicken breasts, pat dry and cut into 1" dice. Follow same instructions as in Step 1.
If using flank steak, separate steak strips into a single layer and pat dry. Season with 1/4 tsp. salt and a pinch of pepper. Follow same instructions as chicken in Step 1, cooking until no pink remains, 4-6 minutes.
If using ground turkey, follow same instructions as chicken in Step 1, breaking up with a spoon until no pink remains, 7-9 minutes.