Put the parsnips, onion, garlic, chilli flakes, stock and salt and pepper in a large saucepan.
Cook over a medium heat for about 20 minutes or until the parsnips are very tender.
Add the milk and blend until smooth. If your soup is too thick when it is finished you can add a little extra milk or stock.
Garlic bread croutons:
Preheat the oven to 200C/400F.
Toss the cubes of bread with the oil, garlic, Parmesan and salt and pepper.
Spread on a baking sheet in one layer, with plenty of space between the cubes, and bake for about 10 minutes. (Keep an eye on them as they can burn.)
To make in the slow cooker:
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