Mustard chicken with cumin sweet potato

Ingredients (serves 4) Olive oil cooking spray 600g orange sweet potato, cut into 1cm-thick rounds 2 medium red onions, cut into wedges 1 tablespoon ground cumin 2 tablespoons wholegrain mustard 2 teaspoons lemon juice 3 (500g) chicken breast fillets, trimmed 60g baby spinach Lemon wedges, to serve   Method: Preheat oven to 200°C/180°C fan-forced. Place sweet…