Making your own is great as you know exactly what has gone in them and it's simple too!!
Firstly claen and chop your potatoes into any shape you want and then put them in a bowl of water to remove and excess starch.
Whilst the potatoes are in water chop as many chillies and as much garlic as you wish to use, ( I use two hot chillies and a bulb of garlic.
Put them in a blender and then whiz for a while. Then add oil, enough to coat your potatoes and whiz again until all nicely blended.
Drain the potatoes and add your seasoned oil ...coat well by turning over in the oil, placing on a baking tray in the top of a hot oven until crispy brown, (about 1/2 an hour).