Preheat your oven to 450 degrees and line a baking sheet with parchment paper.
Place the wedges in a bowl and drizzle olive oil over the potatoes followed by the garlic powder, oregano and a couple of grinds of pepper. Toss to combine then transfer to the baking sheet.
Place in the oven and bake for 20 minutes. Remove from the oven and flip the potatoes.
Bake for an additional 10-20 minutes, or until crispy. Remove from the oven and immediately sprinkle with salt.
While the potatoes are cooking, combine all of the dipping sauce ingredients in a bowl and stir to combine. Taste and adjust seasonings as needed. Add water until desired consistency is reached. Place in the fridge until ready to use.
Top the potatoes with chives and cilantro and serve with the mustard tahini sauce.