If using whole chicken breasts, pat dry and cut into 1" dice. Follow same instructions as diced chicken.
If using shrimp, follow same instructions as chicken in Step 1, cooking until shrimp reaches minimum internal temperature, 2-3 minutes per side.
If using tofu, line a plate with a paper towel. Cut tofu into 1" dice and place on towel-lined plate. Top with paper towels, then press gently but firmly to remove excess moisture. Follow same instructions as chicken in Step 1, stirring occasionally until golden brown, 6-8 minutes.