Clean the potatoes - no need to peel, and cut them in to chunky chip pieces, try to keep them the same thickness. Add them to a pot of salted cold water and bring to the boil, then simmer for 5 mins. Make sure they aren't over boiled and falling apart. Drain and put to one side.
Pre heat oven to 220ºc / 425f
In a large bowl mix together the olive oil, chilli, salt, rosemary, thyme and pepper. Pop the chips in and cover with the oil and herb mixture. Use your hands so as not to break up the chips.
When they are properly covered, lay them on a baking tray covered with tin foil, try not to overlap the chips. Pour over any of the oil mixture that is left over. Pop them in the oven for 30mins. After 20mins turn them over gently.
Once they are golden brown, take them out and serve with ketchup
Notes
Nutritional values are based on one of four servings.