Wash and chop the broccoli and cauliflower into large chunks. Finely slice your onion and crush the garlic.
Put the broccoli, cauliflower, onions, garlic, stock and plenty of salt and pepper into a large saucepan.
Bring to the boil and simmer for 15 minutes or until the vegetables are just cooked through.
Remove from the heat. Add the milk and cheese and blend until smooth.
Heat through again before serving if needed.
Top with the remaining grated cheese and croutons if using.
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