Bring a large pot of water to a boil. Boil the potatoes for 15-20 minutes until fork tender.
Drain them and add them to a large bowl.
Preheat the oven to 400 F.
Pour the olive oil into the bowl of potatoes and toss them with the oil, za'atar, salt, lemon zest and parsley. Mix well.
Transfer to a large baking sheet. Smash each potato flat with the bottom of a glass
Bake the potatoes for 20 minutes. Flip each one and bake for an additional 15 minutes.
Prepare the chipotle tahini by blending the ingredients together in a blender or with an immersion blender.
Drizzle over the potatoes before serving, garnish with fresh parsley and enjoy.
The chipotle tahini will stay fresh in the fridge for up to 2 weeks