If using wild-caught salmon fillets, follow same instructions as salmon in Steps 2 and 3, flipping potatoes, then roasting 5 more minutes before adding salmon. Add salmon, then roast until salmon reaches minimum internal temperature, 9-11 minutes.
If using chicken breasts, pat dry, and season both sides with a pinch of salt and pepper. In Step 1, roast potatoes 5 minutes. Follow same instructions as salmon in Step 3, roasting until chicken reaches a minimum internal temperature of 165 degrees, 17-20 minutes.