Heat oven to 425F.
Bring a pot of salted water to boil.
Once boiling add whole mini potatoes and cook until just knife tender, about 10-15 minutes.
Strain potatoes from water. Allow to cool until able to handle with your hands. Then cut in half, lengthwise.
Line a baking sheet with parchment paper or foil.
Place potatoes on baking sheet and toss with olive oil and za'tar. Sprinkle with salt.
Line potatoes with the skin side down on baking sheet. Roast in oven for about 15-20 minutes, until you notice some browning color on your potatoes. Then, broil on high for a couple minutes until the tops are further browned and crisped to your liking.
Once out of oven, sprinkle additional salt as needed to taste.