Transfer tilapia to a clean, dry plate. Season both sides of both fillets with 1 tsp blackened season each, gently patting seasoning onto each side, use more or less as desired for more or less heat. Add a pinch of salt to each side before the seasoning, if desired (I personally don't use it for this recipe). Place in refrigerator and let sit 30 minutes to 1 hour. This part's important, just like a marinade.
https://cookpad.com/us/recipes/361433-blacken-your-soul-seasoning