Originally Posted by phill363:
“You're doing it wrong if you use a deep filled roasting tin, they are just going to come out greasy and soggy, better on a flat baking tray with a small amount of oil or even one of those 1 cal spray oils”
Absolutely. In my experience, a small surplus of oil on the surface of the roaster/tray somehow draws its way up the potatoes to the top as they cook, and results in perfectly cooked home-made oven chips. You don't need to turn them half way through. Too much oil leaves them greasy with a soft surface and not enough just leaves you with dried-out potatoes that don't taste of chips.
That's after basting them all in oil first. Spooning/poring the right amount of oil into the tray in the first place is a matter of practice. You judge that upon the amount of chips. I also use a thick gauge roaster that I place with the oil over a hob to heat it before I tip in the chips from the pan (after boiling). I then turn each chip with a fork to cover it in hot oil and put the final results into the oven to cook.
I roast them for 30-40 minutes and they come out with barely any oil left at the bottom. I prefer to use a roaster rather than a baking tray, simply because the hot oil does spit a bit, and the high sides of a roaster catches them. Whereas a flat tray allows the oil to spit into the oven.
I think the way you dry the chips after boiling them is important. The drier they are, the better they will be. But the drier they become, the more potato you'll lose to the surface of the pan when you toss them to abrase the surface. So you have to strike a balance.
Once you perfect oven chips with the right variety of potato, oil and methods, you'll never go back to deep frying in the home!
But... all things considered... nothing will ever beat your favourite chip shop!