Wash your potatoes and check them over for any damage, blemishes or eyes and remove them.

Prick your potatoes with a fork or slice them down the middle with a knife.

Place them on a microwavable plate and pop into your microwave.

Cook on high for about 4 minutes.

Remove them from the microwave.

Insert your extender ring if you have one.

Set the oven temperature to 190C.

Brush on your olive oil if you are using it.

Wrap your potatoes in silver foil but leave the tops open. Although it takes longer for them to cook in foil if you don't use it you may find the outsides cook and the insides don't.

Place your potatoes into the oven on the high rack. (Lower rack if you do not have an extender ring) and cook for about 25-35 minutes.

About 15-20 minutes into cooking pull back the silver foil to allow the skins to crisp

Check your potatoes are ready by pressing a knife into them if it slides easily they are ready if not give them a few more minutes 5-7 minutes should do it.

Remove your jacket potatoes from the halogen carefully as the glass is very hot. Either use tongs or long oven gloves for safety.