Luxe potato skin gratin

Fruit and vegetables

1kg/2lb 4oz potato skins (defrosted if they are frozen)
3 garlic cloves, crushed
4 tbsp onion powder

Cooking ingredients

2 tbsp freshly ground black pepper
salt

Dairy, eggs and chilled

butter, for greasing
300ml/10fl oz full-fat milk
300ml/10fl oz double cream
100g/3½oz Parmesan, grated

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