Preheat the oven to 400°F (200°C). In a large bowl, toss chickpeas, zucchini, red bell pepper, broccoli, and sweet potato with olive oil, smoked paprika, garlic powder, cumin, salt, and black pepper until evenly coated.
Spread the veggies and chickpeas in a single layer on a baking sheet.
Roast in the oven for 25–30 minutes, stirring halfway through, until tender and lightly caramelized.
While the veggies roast, whisk together tahini, maple syrup, Dijon mustard, apple cider vinegar, and 2–3 tablespoons water until smooth. Adjust consistency as needed and season with salt and pepper.
Divide cooked grains into serving bowls and top grains with the roasted veggies and chickpeas.
Drizzle generously with the maple Dijon tahini dressing and garnish with fresh herbs and serve with lemon wedges if desired.