Slow Cooker Chicken Leek and Potato Cream Soup

Name: Slow Cooker Chicken Leek and Potato Cream Soup
Prep time: 20 min
Total time: 20 min
Yield: 6 servings
Cuisine: French
Ingredients: 1¾ lb (800 g) boneless, skinless chicken breasts, cut into 1-inch (2.5 cm) cubes; 3 whole large leeks, white and light green parts only, halved lengthwise, sliced into ½-inch (1.3 cm) half-moons, rinsed thoroughly; 1½ lb (680 g) Yukon Gold potatoes, peeled, cut into ½-inch (1.3 cm) cubes; 6 cups (1440 ml) low-sodium chicken broth; 1 cup (240 ml) heavy cream, cold; 4 sprigs fresh thyme sprigs; 1 whole bay leaf; kosher salt, to taste; freshly ground black pepper, to taste; 1 tablespoon (14 g) unsalted butter (optional)

From the MyKitchenBank Kitchen

A silky, comforting French-inspired soup with tender chicken, sweet leeks, and potatoes simmered gently in a slow cooker until the flavors meld into creamy richness. Heavy cream and fresh thyme finish this elegant yet easy one-pot meal that tastes like it simmered for hours—because it did.

Prep: 20 min
Cook: —
Wait: 8 hr
Total: 8 hr 20 min
Makes: About 9 cups (2.1 L), 6 servings

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Steps

Before you start

Trim and slice leeks well ahead so they're ready to go
Ensure your slow cooker insert is clean and dry
Have all ingredients prepped and ready to assemble in the morning for an evening meal
If using frozen chicken, thaw it completely before cooking

1
Assemble in slow cooker
- Add the cubed chicken, sliced leeks, diced potatoes, chicken broth, thyme sprigs, and bay leaf to your 6-quart (5.7 L) slow cooker.
- Stir gently to combine and ensure all solids are submerged in the broth.
- Do not add the heavy cream yet.
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Tip: Clean leeks thoroughly by splitting them lengthwise and rinsing between layers to remove any grit trapped during growth.
2
Cook on low 8 hours
- Cover the slow cooker and set to low heat.
- Cook for 8 hours (or up to 10 hours), until the chicken is very tender and the potatoes begin to fall apart at the edges.
- The broth should smell rich and aromatic, and most of the potatoes should be softening naturally into the liquid.
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Ready when: Chicken shreds easily with a spoon; potato cubes are beginning to soften and blur into the liquid at edges; chicken reaches 165°F (74°C) at the thickest part
Tip: Avoid lifting the lid frequently—every opening adds 15 minutes to cook time.
3
Remove herbs and adjust consistency
- Remove and discard the bay leaf and thyme sprigs with a spoon or slotted utensil.
- If you prefer a chunkier soup, skip to the next step.
- For a slightly creamier, more blended texture, use an immersion blender to partially purée the soup directly in the slow cooker—pulse 5–8 times until some potatoes are broken down but chunks remain.
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Tip: Do not over-blend; a rustic, chunky soup is traditional and more flavorful than a purée.
4
Stir in cream and season
- Turn the slow cooker to high if it was on low.
- Pour the cold heavy cream into the soup slowly while stirring gently with a wooden spoon to incorporate evenly.
- Heat for 10–15 minutes, stirring occasionally, until the cream is fully incorporated and the soup is hot throughout but not boiling.
- Taste and season with kosher salt and freshly ground black pepper to your preference.
- If desired, stir in the optional tablespoon of butter for extra richness.
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Ready when: Soup is steaming and reaches 165°F (74°C) at the thickest part; no chill at the spoon
Tip: Add cold cream to a hot broth carefully to avoid curdling—stir as it goes in so it combines evenly.
5
Serve hot
- Ladle the soup into warm bowls.
- Serve immediately with crusty bread, fresh thyme as a garnish, and extra salt and pepper on the side if guests prefer.
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Tip: Warm your serving bowls by running them under hot water or heating them in the slow cooker while the soup finishes—cold bowls chill the soup quickly.

Good to know

Tips

Thoroughly rinse sliced leeks by placing them in a bowl of cold water and swishing gently—sand hides in the layers.
Yukon Gold potatoes break down slightly during slow cooking, which thickens the broth naturally without cream—choose this variety over russets for the best texture.
Do not skip the bay leaf; it adds depth and a subtle aromatic note that rounds out the flavors, but remove it before serving (it's easy to overlook).
For a lighter version, use half-and-half instead of heavy cream, or add a roux-thickened broth (melt 1 tablespoon butter with 1 tablespoon flour, whisk into the broth before adding to the slow cooker) instead of cream.

Make ahead

Prepare all vegetables and cut the chicken the night before, storing them separately in the refrigerator. In the morning, add everything to the slow cooker and proceed. You can also complete the entire recipe through step 3, cool it to room temperature, and refrigerate for up to 2 days; reheat gently on low in the slow cooker or on the stovetop, then add the cream in the final step for the best texture.

Storage & reheating

Refrigerate in an airtight container for up to 3 days. Freeze for up to 3 months (add cream after thawing and reheating, as freezing can separate it). To reheat, thaw overnight in the refrigerator, then warm gently on the stovetop over medium-low heat, stirring occasionally. If reheating from frozen, place in the slow cooker on low for 2–3 hours, then proceed with the cream step.

Substitutions

boneless, skinless chicken breasts → Chicken thighs (boneless, skinless, cut into 1-inch pieces). Thighs stay more tender and flavorful in slow cooking but may need skimming of excess fat after cooking.
heavy cream, cold → Crème fraîche or Greek yogurt (full-fat, added off heat after cooking). Both add tang and richness; stir in after cooking is complete to prevent curdling.
Yukon Gold potatoes → Celery root or parsnips (peeled and cubed). Celery root adds earthiness; parsnips add sweetness. Use the same weight and adjust seasoning to taste.
fresh thyme sprigs → Dried thyme (1 teaspoon) or fresh tarragon sprigs (2 sprigs). Dried thyme may taste slightly more medicinal; tarragon offers a subtle anise flavor that is also French and delicious.