Preheat the oven to 400°F (200°C). Toss chickpeas and sweet potato cubes with olive oil, garlic powder, and salt, then spread them on a baking sheet.
Roast for 20-25 minutes, stirring halfway through, until chickpeas are crispy and sweet potatoes are caramelized.
Meanwhile, cook the quinoa according to package instructions and let it cool slightly.
Prepare the tahini dressing by whisking together tahini, lemon juice, maple syrup, and a splash of water until smooth.
Assemble the bowl by layering quinoa, roasted chickpeas, sweet potatoes, cabbage, and avocado slices.
Drizzle with tahini dressing and garnish with fresh herbs. Serve immediately.