I've been trying to make homemade baked potato chips, I have figured out everything, except how to get the seasoning to stick to the chips. The recipe I'm using, calls for you to toss the chips in a bowl of seasoning right out of the oven. The seasoning is not sticking.
Since the potato slices are moist after cutting and before baking, season them at this point rather than afterwards. This will cause the seasoning to cling to the potato better, even after they have been dried in the oven.
Also, I have had good results using an "Air Fryer" (Which is technically not 'frying' but convection baking.)