Preheat oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper.
In a large mixing bowl, combine chickpeas, sweet potatoes, bell peppers, red onion, and broccoli.
Drizzle olive oil over the mixture and add smoked paprika, cumin, garlic powder, salt, and pepper; toss until all components are evenly coated.
Spread the vegetable and chickpea mixture onto the prepared baking sheet in a single, even layer to ensure uniform roasting.
Roast in the center of the oven for 25 minutes, tossing the ingredients halfway through the cook time, until vegetables are fork-tender and chickpeas are slightly crispy.
In a small bowl, whisk together tahini, lemon juice, maple syrup, and warm water until the dressing is smooth and pourable.
Assemble the bowls by placing 0.5 cups of cooked quinoa in each of the four bowls, then topping with equal portions of the roasted vegetable and chickpea mixture.
Drizzle the prepared tahini dressing over each bowl and serve immediately.