Leek and Potato Soup with Stilton Croutons

A smooth leek and potato soup is one of the most dependable British-style cold-weather bowls: mild, savoury and naturally creamy from the potatoes once blended. Leeks give a gentle onion sweetness without sharpness, while vegetable stock and a little double cream keep the texture silky rather than heavy. What sets this version apart is the topping: crisp cubes of crusty bread tossed with Stilton so the cheese softens and clings to the croutons. The result is a simple vegetarian soup with a rich, salty finish and welcome crunch, easy enough for a weeknight dinner but polished enough to serve as a starter.
Cuisine style British comfort food
Flavor profile Creamy • Savoury • Tangy blue cheese finish
Techniques Sweating leeks • Simmering • Blending
Key equipment Large pot • Immersion blender • Frying pan
Cooking style Make-ahead friendly • Freezer-friendly • Minimal cleanup
Time commitment Under 1 hour

Why this recipe works

  • Smooth, creamy texture: Starchy potatoes give the soup natural body once blended, so the cream enriches rather than carries the whole dish.
  • Gentle savoury base: Softening the leeks without browning keeps their sweetness clean and mellow before the stock and potatoes are added.
  • Crunchy, salty topping: Crisp croutons coated with Stilton add bite and sharpness, balancing the mild, velvety soup.

Get the most out of this recipe

Texture tips

  • For an extra-smooth soup: Blend thoroughly until no pieces of leek or potato remain, then let the soup stand briefly so trapped air bubbles settle before serving.
  • Keep the cream silky: After adding the double cream, warm the soup gently rather than boiling it to help prevent splitting.
  • Keep the croutons crisp: Add the Stilton croutons just before serving so they keep their crunch against the hot soup.

Ingredient notes

  • Wash leeks carefully: Leeks often hold grit between their layers, so slice them lengthways and rinse well before chopping.
  • Use a floury, buttery potato: Yukon Gold potatoes blend smoothly and give the soup a rounded, naturally creamy body.
  • Day-old bread works well: Slightly stale crusty bread toasts more evenly and holds its shape better when tossed with the Stilton.

Make-ahead tips

  • Make the soup in advance: The soup can be cooked, blended and chilled, then reheated gently on the hob until piping hot.
  • Store the topping separately: Keep the croutons apart from the soup and re-crisp them briefly in a dry pan before serving.
  • Freeze without croutons: Freeze the soup on its own, then defrost overnight in the fridge and reheat slowly, stirring often.

Common mistakes

  • Browning the leeks: Cook the leeks gently until soft but not coloured; browning can make the soup taste heavier and less fresh.
  • Leaving the potatoes undercooked: The potatoes should be very tender before blending, otherwise the soup can turn grainy rather than smooth.
  • Storing croutons with the soup: Croutons soften quickly in moisture, so store them at room temperature rather than in the soup container.

Equipment you'll need

Ingredients

Soup

Stilton croutons

Instructions
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  1. Trim the leeks, slice lengthways, then rinse well to remove any grit. Slice the leeks, peel the potatoes and cut them into roughly even chunks.
  2. Melt the butter in a large pot over a medium heat. Add the leeks with a pinch of the salt and cook for 8 to 10 minutes, stirring, until softened but not browned.
  3. Add the potatoes, vegetable stock, remaining salt and the black pepper. Bring to the boil, then reduce to a gentle simmer and cook for 15 to 18 minutes, until the potatoes are very tender.
  4. While the soup simmers, cut the bread into bite-sized cubes. Toast in a dry frying pan over a medium heat for 4 to 6 minutes, tossing often, until crisp and golden.
  5. Reduce the heat to low and sprinkle the Stilton over the croutons. Toss for 1 to 2 minutes until the cheese softens and clings to the croutons, then tip onto a plate so they stay crisp.
  6. Blend the soup until completely smooth, then stir in the double cream. Warm gently for 2 to 3 minutes until steaming, tasting and adjusting seasoning if needed.
  7. Ladle the soup into bowls and top with the Stilton croutons. Serve straight away while the croutons are crisp.

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Recipe notes

Tips

  • For the smoothest texture, blend the soup for a full minute, then let it sit for 2 minutes so any bubbles rise before serving.
  • Keep the heat low after adding the double cream so the soup stays silky and does not split.
  • If serving to young children, crumble the Stilton more lightly over the croutons for a milder finish.

Substitutions

  • Replace Double cream with Cooking cream for a lighter, less rich soup.
  • Replace Stilton cheese with Blue cheese for a similar tangy topping.
  • Replace Crusty white bread with Country bread for sturdier croutons.

Storage

  • Refrigerate up to 3 days
  • Store the soup in an airtight container in the fridge and reheat gently on the hob until piping hot, stirring often. Freeze the soup without the croutons for up to 3 months; defrost overnight in the fridge before reheating. Store the croutons separately at room temperature and re-toast briefly in a dry pan to re-crisp.

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Recipe overview

  • Servings: 4 bowls
  • Total time: 45min (20min active)
  • Difficulty: Easy
  • Cuisine: British
  • Allergens:
    Gluten Milk Wheat
Beginner friendly Freezer friendly Kid friendly

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