Chicken cottage pie | Tesco Real Food

Ingredients

• 750g floury potatoes, peeled and chopped
• 25g butter
• salt
• pepper
• 50g butter
• 1 onion, peeled and finely chopped
• 2 garlic cloves, finely chopped
• 2 leeks, white part only, sliced
• 2 celery stalks, sliced
• 50g plain flour
• 300ml chicken or vegetable stock
• 1 bay leaf
• 500g cooked cold chicken, cut into small pieces
• 1tbsp flat-leaf parsley, chopped
• 50g Gruyère cheese, grated