Lemon-spiced chicken casserole

Ingredients

• 4 chicken breast fillets, skinless and boneless, diced
• Plain flour, for dusting
• 1 tablespoon vegetable oil
• 1 medium onion, finely sliced
• 1–2 cloves garlic, finely diced
• 250g new potatoes, halved or quartered depending on size
• 1 lemon, zest and juice
• 1 teaspoon ground cumin
• 1 small handful fresh coriander, roughly chopped
• 1 teaspoon ground cinnamon
• Freshly ground black pepper
• 410g can chickpeas in water, drained
• 200ml reduced-salt chicken stock
• 250g fresh or frozen spinach