Peel the potatoes. In order to cut them evenly deep and not completely, it is best to place a wooden spoon on the left and right, for example, next to each potato and cut till the wooden spoon.
Mix the oil and salt. Peel the garlic cloves and cut into fine slices.
Place the potatoes on a baking sheet and spread the oil on top. Put the garlic slices in the cut potatoes.
Bake the potatoes in the preheated oven on the middle rack for about 45 minutes, until they are crispy on the outside and soft on the inside.