Switch the oven on to 200C and put the baking sheet with the oil on into the oven.
Peel and cut your potatoes into cubes. Dry the cubes of potato.
When the oven has reached temperature, bring out the tray of hot oil and carefully put in the potato cubes and cover in the oil.
Return to the oven for 40 minutes. Shuffle the potatoes around a couple of times during this cooking time.
Add the garlic, rosemary, thyme and salt and pepper to the potatoes and cook for another 5 minutes.
Note 1 - OilIf you're NOT using a non-stick baking tray (or if you're not using reusable baking paper) you may need an additional tablespoon of oil.Note 2 - HerbsI like to use fresh herbs here as they give SO much flavour. Each tablespoon of fresh chopped herbs is the equivalent of 3g in weight. If you only have dried herbs, use a TEASPOON of each instead of a TABLESPOON of fresh.