One-pot chicken pilaf

INGREDIENTS

• 1 tsp sunflower oil
• 1 small onion , chopped
• 1 large or 2 small boneless, skinless chicken thigh fillets, cut into chunks
• 2 tsp curry paste (choose your favourite)
• a third of a mug basmati rice
• two-thirds of a mug chicken stock
• 1 mug frozen mixed vegetables
• half a mug frozen leaf spinach