Wash and scrub the potatoes to get rid of dirt on them. Let them dry.
Using a sharp knife, slice the potatoes thinly in such a way that you don't separate the slices. Instead, you should leave about ¼ inch of the whole potato at the bottom.
Place the potatoes in a greased cast-iron skillet or a baking tray.
Place a saucepan on medium heat. Add oil.
Once the oil is hot, add chopped garlic, turmeric, rosemary, and salt.
Cook for about 3 minutes. Take it off the heat and let it cool down a bit to infuse the flavors.
Using a brush, baste this prepared oil on the potato and in between the slices generously.
Place the cast-iron skillet or baking tray in a preheated oven at 425-degree F for about 60 minutes or until the edges of the potatoes turn golden brown.