Line a large baking sheet with parchment paper, and add the cauliflower and the chickpeas to the pan
In a small bowl, combine all the spices together. Toss the cauliflower with the olive oil and sprinkle on the spices. Mix together thoroughly until they're evenly coated.
Bake for 30 minutes. Remove from oven, give the veggies a toss and bake for an additional 15-20 minutes.
While that bakes, prepare the yogurt tahini sauce by mixing all of the ingredients together in a bowl until smooth. Add the water at the end if needed to thin the sauce. Serve as a dip or drizzle over the roasted cauliflower.
Leftovers will stay fresh in the fridge for up to 5 days.