Preheat oven to 200°C. Toss sweet potato and chickpeas with smoked paprika and cumin (no oil — they'll roast fine dry, or use a splash of vegetable stock to help spices stick). Spread on lined baking tray.
Roast 25-30 minutes, tossing halfway, until sweet potato is tender and chickpeas are slightly crispy.
Whisk dressing ingredients until smooth, adding water to reach drizzling consistency.
Assemble bowls: quinoa, massaged kale, roasted sweet potato, chickpeas, red cabbage, avocado. Top with seeds and pickled onion.
Drizzle with tahini dressing.