I've never had blackened chicken before but I found this recipe for you. If you like this way of seasoning you might want to get a small covered dish or a jar and keep it in it.
Yes, Erik, just this past week I've tried Prudhomme's Blackening Seasoning for Fish (I used it on chicken) and also his Blackening Seasoning for Steak (I used it on steak and on pork chops). Not a lot of difference in flavor between the two bottles, but the stuff IS fantastic. Blackens beautifully!