Creamy chicken & sweetcorn soup - Good Food Middle East

Ingredients

• 1 tbsp olive oil
• 1 celery stick
• 1 leek, finely sliced
• 300ml strong chicken stock
• 250g sweetcorn (use fresh or frozen), half of it crushed lightly with a fork
• 200g greens (such as spinach or kale), finely sliced
• small bunch chives, finely snipped
• 25g butter
• 25g plain flour
• 250ml milk
• 1 tsp olive oil
• 2-3 (depending on size) skinless chicken thigh fillets, cut into cubes
• 1 skinless chicken breast, cut into cubes
• ? onion, very finely chopped (optional)