If making the Cajun spice blend, add all of the spices to a small bowl, mix together and set aside.
Pat cod fillets dry to remove excess moisture.
Add a ½ teaspoon of honey to the top of each fillet, if using. Use a silicone pastry brush or the back of a spoon to distribute the honey over one side of the fish.
Sprinkle seasoning on both sides of the cod fillets, pressing into flesh as needed. You can also season one side, place it seasoned side down in the pan, and sprinkle the remaining seasoning over the top while it's cooking.
Heat olive oil in a skillet over medium-high heat.
Place cod in the skillet and cook for 4 minutes, undisturbed. Flip over the fillets and cook for 4 minutes more. The flesh should be white and flaky when cooked through and done. The internal temperature for fish should reach 145 °F.
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