Slow Cooker Potato Soup

That’s really the whole pitch. You dice everything, dump it in the crock pot, and walk away for three hours. No babysitting a pot of potatoes so they don’t scorch on the bottom. No worrying if the broth’s reducing too fast. The slow cooker just… does it.

Why This Works

Potatoes need low, steady heat to break down evenly without turning gluey on the outside before the middle’s done — that’s exactly what a slow cooker on high gives you over three hours, unlike a stovetop simmer where the bottom of the pot runs hotter than the rest of the liquid.

The order matters more than it looks like it should. Cream and sour cream go in at the very end, after the vegetables are already tender, because dairy that simmers for hours can break — you’ll get little curdled flecks instead of a smooth soup. The flour slurry goes in right before the dairy for the same reason: it needs a few minutes of heat to thicken the broth, but not three hours of it.

Ingredients

• 2 stalks celery
• 2 carrots
• 1 yellow onion
• 3 cloves garlic
• 3 lbs Yukon gold potatoes
• 1 tsp Italian seasoning
• 1 1/4 tsp salt
• 1/2 tsp freshly cracked black pepper
• 3 cups chicken broth
• 2 Tbsp all-purpose flour
• 2 Tbsp water
• 1/2 cup heavy cream
• 1/2 cup sour cream
• 1 cup shredded cheddar cheese, divided
• 3 green onions, sliced and divided

Instructions

1. Wash and dice the celery stalks, peel and dice the carrots, dice the onion, and mince the garlic.
2. Wash, peel, and chop the potatoes into ½–¾ inch chunks.
3. Add the potatoes, carrots, celery, onion, and garlic to a 5 or 6 quart slow cooker.
4. Add the Italian seasoning, salt, and black pepper.
5. Pour the chicken broth over everything.
6. Stir until it’s evenly distributed.
7. Cover and cook on high for 3 hours.
8. Once the potatoes are almost done, whisk the flour and water together in a small bowl until smooth.
9. Check the potatoes — they should be tender enough to pierce easily with a fork.
10. Add the flour slurry, heavy cream, and sour cream to the slow cooker.
11. Stir well, put the lid back on, and cook on high another 10 minutes.
12. While that finishes, shred the cheddar and slice the green onions if you haven’t already.
13. Remove the lid and mash some of the potato chunks with a potato masher — you want a mix of mashed and chunky, not baby food.
14. Stir in ½ cup of the cheddar and half the green onions.
15. Keep stirring until the cheese melts in completely.
16. Taste. Adjust salt and pepper.
17. Ladle into bowls and top with the rest of the cheese and green onions. Serve hot.

Prep & Cook Time

• Prep time: 20 minutes
• Cook time: 3 hours 10 minutes
• Total time: 3 hours 30 minutes
• Servings: 6, about 1.5 cups each
• Cost: $8.10 total / $1.35 per serving

Tips

• Use a genuinely flavorful chicken broth. This soup doesn’t have a ton of ingredients doing heavy lifting — the broth is carrying most of the flavor, so a weak, watery one gives you a weak, watery soup.
• Don’t skip the mash step. Mashing some of the potatoes is what thickens the soup and gives it that classic potato-soup body — without it you’d basically have vegetable soup with potato chunks floating in it.
• Add the dairy at the very end, not before.

Variations

Bacon is the obvious add-in here and it’s worth it — crisp a few strips, crumble them in with the last round of cheese and green onions. Skip the idea of swapping in russets for the Yukon golds, though; russets break down into a grainier, starchier texture instead of the creamy one Yukon golds hold onto. If you want it lighter, you can drop the sour cream and use only heavy cream, but you lose some of the tang that makes this taste like more than just mashed potatoes in broth.

Make-Ahead

This one doesn’t love sitting around before serving — the potatoes keep absorbing broth as it cools, so a soup that was perfectly thick at dinner turns almost pasty by the next day. If you’re making it ahead, undercook the potatoes slightly and thin with a splash of broth or milk when reheating. Leftovers keep fine in the fridge for a few days; just reheat gently on the stove, since a full boil can cause the dairy to separate again.

FAQ

Can I make this on low instead of high? Yes — cook on low for about 6 hours instead of high for 3, then follow the same steps for the final 10-minute dairy stage. High is faster and works fine for potatoes this size, so that’s what I default to.

Why did my soup turn out grainy or curdled? That’s almost always the dairy hitting too much heat for too long. Add the cream and sour cream at the end, after the flour slurry, and only cook another 10 minutes on high — not longer.

Can I use russet potatoes instead of Yukon gold? You can, but I wouldn’t. Yukon golds hold a creamy texture when mashed; russets go grainy and starchy, which changes the whole feel of the soup.

Is this soup freezer-friendly? Not really recommended. Potato soups with dairy tend to separate and get grainy after freezing and thawing — the texture just isn’t the same coming back.

What can I use instead of heavy cream? Half-and-half works in a pinch, though the soup will be a little thinner and less rich. Skipping the cream entirely and doubling the sour cream is another option if that’s what you have on hand.

Closing Thoughts

This is the kind of soup that’s better the day you make it, straight out of the crock pot, cheese still stringy on top.

About the Author

Kima tests slow cooker and one-pot recipes at home before they make it onto Kima Recipe, focusing on weeknight meals that hold up on a busy schedule.