Cajun chicken gumbo

INGREDIENTS

• 4 tbsp olive oil
• 5 skinless chicken breasts , cut into chunky pieces
• 1 onion , chopped
• 2 celery sticks, sliced
• 3 bay leaves
• 5 tbsp plain flour
• 4 tsp Cajun spice mix (or 1 each paprika, ground cumin, ground chilli and dried basil)
• 600ml chicken stock (made with 2 stock cubes)
• 2 green peppers , deseeded and cut into chunks
• 300g thickly sliced ham , trimmed of any fat and diced
• 3 spring onions , sliced
• 2 tbsp very roughly chopped parsley