Sweet potato and corn chowder

Ingredients

• cal cooking spray*
• onion, finely chopped
• celery stick, finely chopped
• leeks, finely sliced
• garlic cloves, crushed
• sprigs of fresh thyme, leaves picked
• dried chilli flakes
• medium sweet potatoes , chopped into 1cm cubes
• litre low-salt vegetable stock
• frozen sweetcorn, defrosted and warmed through
• Juice of ½ lemon
• fat-free natural Greek yogurt, to serve
• of smoked paprika, to serve
• small pack fresh chives, chopped, to serve
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