Preheat oven to 450°F(232°C). Line a large baking sheet with parchment paper.
In a large mixing bowl, combine oil, coriander, turmeric, cumin, 1/2 tsp salt, 1/4 tsp pepper and cayenne.
Place chicken in centre of prepared pan; brush each piece with 1/2 tsp oil mixture.
Add cauliflower to bowl; toss to coat. Place cauliflower around chicken; lightly coat chicken and cauliflower with cooking spray. Sprinkle chicken with remaining 1/4 tsp each salt and pepper.
Roast until chicken is just cooked through, 15-20 minutes; let rest. Toss cauliflower with chicken juices in pan; continue roasting until browned and tender, about 10 minutes more. Add cilantro; toss.
Thickly slice chicken across grain; fan over serving plates. Divide cauliflower among plates; squeeze 1/2 lime over top and serve with additional lime wedges.