Preheat oven to 220°C (425°F).
Rinse quinoa under cold water.
Cook quinoa in vegetable broth with salt. Boil, then simmer covered 15 minutes. Rest 5 minutes. Fluff with fork.
Dice zucchini, bell peppers, and red onion. Halve cherry tomatoes. Pat chickpeas dry.
Spread vegetables and chickpeas in a single layer on a large baking sheet.
Drizzle with olive oil. Add cumin, paprika, garlic powder, salt, and pepper. Toss to coat.
Roast 25–30 minutes, tossing once halfway. Edges should be golden.
Whisk tahini, lemon juice, olive oil, and garlic. Thin with water until pourable. Season with salt.
Divide quinoa between four bowls. Add roasted vegetables and chickpeas.
Drizzle tahini dressing over each bowl. Top with herbs, sesame seeds, and feta if using.
Serve warm with lemon wedges.