One-Pan Potato Leek and White Bean Soup
Thick, cozy soup from scratch in one pot — cheap enough for any night.
It's the kind of night where you want something warm and filling but can't justify spending much or doing many dishes. This potato leek and white bean soup is exactly that: a genuine, satisfying bowl built on cheap vegetables and a can of beans. The leeks melt into the broth, the potatoes go soft and creamy, and the white beans add body without any fuss. Everything happens in one pot in under 45 minutes. It's not fancy, but it's the real thing — and it reheats beautifully for lunch tomorrow.
Ingredients
- 2 tbsp olive oil or neutral oil
- 2 unit large leeks — white and light green parts only, sliced into half-moons and rinsed well
- 4 unit garlic cloves — minced
- 1.5 lb Yukon Gold or russet potatoes — peeled and cut into 3/4-inch chunks
- 1 unit can (15 oz) white beans — cannellini or great northern, drained and rinsed
- 4 cup vegetable broth — low-sodium preferred
- 1 cup water
- 1 tsp dried thyme
- 1 tsp salt — plus more to taste
- 0.5 tsp black pepper
- 1 pinch red pepper flakes — optional
- 1 tbsp lemon juice — fresh or bottled, added at the end
Method
- 1 Heat the oil in a large pot or Dutch oven over medium heat. Add the sliced leeks and a pinch of salt. Cook, stirring occasionally, for 6–8 minutes until the leeks are soft and just starting to turn golden at the edges.
- 2 Add the minced garlic and dried thyme. Stir and cook for 1 minute until fragrant.
- 3 Add the potato chunks, drained white beans, vegetable broth, water, salt, black pepper, and red pepper flakes if using. Stir to combine.
- 4 Bring to a boil, then reduce heat to medium-low. Cover and simmer for 18–22 minutes, until the potatoes are completely tender and break apart easily when pressed with a spoon.
- 5 Use a potato masher or the back of a large spoon to roughly mash about a third of the soup directly in the pot. This thickens it without blending — you want chunks remaining for texture.
- 6 Stir in the lemon juice. Taste and adjust salt and pepper. If the soup is thicker than you like, stir in a splash of water or extra broth.
- 7 Ladle into bowls and serve as-is, or with crusty bread if you have it.
Variations
- Add cheddar for a cheesy version — Stir in 1/2 cup shredded sharp cheddar after mashing for a richer, cheesy potato leek vibe. Not vegan, but very good.
- No leeks? Use onion — Substitute 1 large yellow onion, diced, for both leeks. The flavor is sharper and less delicate but works perfectly well and is usually even cheaper.
- Faster version with smaller potato pieces — Cut potatoes into 1/2-inch dice instead of 3/4-inch — they'll be tender in 12–14 minutes instead of 20, saving about 8 minutes total.
Notes
Leeks trap a lot of dirt between their layers — slice them first, then swish the pieces in a bowl of cold water and lift them out, leaving the grit behind. For a creamier soup, blend half with an immersion blender instead of mashing. Leftovers thicken overnight in the fridge; just add a splash of broth when reheating.
Equipment that helps
- Large pot or Dutch oven (4–6 qt) — You need enough surface area to soften the leeks properly without steaming them, and enough depth to hold all the broth without splattering.
- Potato masher — Lets you thicken the soup in seconds by mashing directly in the pot — no blender or extra cleanup needed.
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