Someone probably has it muddled with celeriac chips.
Take a celeriac, cut all the weird peel off, chop into chip shapes. Put in bowl of water and microwave for 2 mins - or boil in a pan - to soften. Dry chips, roll them in oil or butter, sprinkle with seasoning if you like - I like garlic powder and Parmesan - and bake on oven for 30-40 minutes.
They don't go crispy like chips, or taste exactly like them but they're still nice. Great roasted as a replacement for roasties and parsnips on a Sunday, too.