For Celeriac chips simply follow the instructions for oven baked potato chip (see here) (but swap the potato to Celeriac.

For Celeriac Crisp see recipe at https://www.riverford.co.uk/recipes/view/recipe/celeriac-crisps

Variation you can also make carrot (S) or parsnip (S) crisps if you wish. (moderate salicylates).