1: Preheat the oven to 180°C fan forced or 200°C conventional. Line a baking tray with baking paper and set aside.
2: Cut thin slits into the potatoes, stopping just before the bottom. Slice a tiny piece off the bottom for stability if needed.
3: Mix the oil, garlic, and rosemary. Coat the potatoes in the oil mix, getting into all the gaps.
4: Bake in the oven for a total of 1 hour. Brush with extra oil halfway through, then return to the oven for the remaining 30 minutes.
5: Remove from oven and generously season with salt and pepper. Enjoy!