Rinse the scallops with cold water. Pat dry with paper towels.
Line a large plate with paper towels, then place scallops on paper towels. Top with more towels and thoroughly pat dry to absorb any liquid to ensure a good sear. Let it sit while you prepare the rest of the ingredients.
Season the scallops with salt and pepper to taste. Then season them with salt-free Creole seasoning (you can omit it if it's too spicy).
Add oil to cast iron or skillet, and heat on medium to high until it almost reaches the smoking point. Add scallops once the cast iron is hot, add scallops, leaving space between them. Sear on each side for 2-3 minutes until almost firm to the touch and golden brown.
To get a good sear, do not turn scallops. Remove the pan from the heat, transfer the scallops to a plate, and set them in a warm spot. Let the pan cool for a minute before proceeding with the sauce.
Add butter to the skillet, followed by the garlic, and saute for a minute or less. Add white wine, stir, and scrape up any brown bits from the side of the pan. Simmer until reduced by about half, another 1-2 minutes.
If desired, add lemon zest, lemon juice, remaining butter, salt, and pepper flakes. Adjust seasonings to taste.
Return the scallops and their juice to the pan. Stir to coat, and add parsley. Remove immediately from the heat and serve in the pan.