Preheat your oven to 425°F.
Remove the leaves from the cauliflower and trim the stem, then cut the head into 1-inch thick 'steaks' (you should get about 2 good steaks; save any loose florets for another use).
Lightly spray both sides of the cauliflower steaks with olive oil cooking spray. Sprinkle evenly with turmeric, cumin, salt, and pepper.
Place the cauliflower steaks on a parchment-lined baking sheet and roast in the oven for 25-30 minutes, flipping halfway through until they are tender and golden around the edges.
While the cauliflower roasts, prepare the roasted chickpeas (if not pre-roasted). Toss canned chickpeas (drained and rinsed) with a little salt, pepper, and a touch of turmeric, then roast them on a separate sheet at 425°F for 15-20 minutes until crispy.
For the drizzle, combine nonfat Greek yogurt, tahini, and lemon juice in a small bowl. Whisk until smooth; adjust seasoning with salt and pepper to taste.
Once the cauliflower steaks are done, plate them and drizzle generously with the tahini-yogurt sauce. Sprinkle the crispy roasted chickpeas on top for added crunch.
Serve warm and enjoy the delicious layers of flavor and texture in this vibrant, protein-conscious dish.