Preheat oven to 475F. Spray a baking sheet with non-stick cooking spray. Place bell pepper, carrots, parsnip, sweet potatoes, onions and zucchini on baking sheet.
Drizzle with 1 tbsp olive oil and season with salt and toss to evenly coat. Roast in preheated oven about 45 minutes until tender, tossing once after 30 minutes of roasting.
While vegetables are roasting, in a small mixing bowl whisk together remaining 3 tbsp olive oil, lemon juice, garlic, cumin, coriander, cinnamon and season with 1/4 tsp salt, set aside.
Bring chicken broth, 1/2 tsp salt and turmeric to a boil. Place couscous and raisins in a large mixing bowl, pour hot chicken broth over couscous and stir, cover bowl with plastic wrap and let rest for 5 minutes.
Add roasted vegetables, chickpeas, almonds, cilantro, mint and lemon mixture to couscous and toss to evenly coat. Sprinkle with sumac and serve warm.