Hi - yes I also still cook chips, and roast potatoes using Olive Oil. Just put a small amount of Olive Oil over the chips ( or par cooked potatoes for roasting ) and half way through cooking turn to brown other side.
This works extremely well if you want to also freeze them. Just cook to a light brown colour - then cool and freeze. Best to use a plastic freezer container for this. They can then be taken straight frm the freezer into the hot oven to cook
Really tasty and much healthier.
Hope this is of help.