Gardener's pie

Ingredients

• 50g reduced-fat Cheddar cheese, grated
• 1 tablespoon vegetable oil
• 1 onion, diced
• 2 cloves garlic, crushed
• 400g tin chopped tomatoes
• 400g tin haricot beans, drained and rinsed
• 300g frozen mixed vegetables such as carrots, peas and green beans
• 1 reduced-salt vegetable stock cube dissolved in 150ml boiling water
• Freshly ground black pepper
• 2 teaspoons dried thyme
• 2 cans new potatoes in water, drained and sliced lengthways