Baked Potato Soup Recipe Without Sour Cream: Creamy Velvety Richness Using Buttermilk

This baked potato soup recipe without sour cream delivers that same velvety richness using buttermilk instead—no tangy aftertaste, just pure comfort in every spoonful. The secret lies in blending cooked potatoes with buttermilk and broth until silky smooth, creating a texture that rivals cream-based soups while keeping it lighter.

I developed this version after realizing how often sour cream was unnecessary for achieving that signature creaminess, and it’s become a weeknight staple that never disappoints.

The magic happens when you roast the potatoes first, which deepens their natural sweetness and gives the soup a more complex flavor than stovetop-only methods.

A touch of butter and flour creates a simple roux that thickens the broth beautifully, while garlic and onion add aromatic depth without overpowering the potato’s earthy sweetness. This approach ensures the soup stays creamy even when reheated, making it perfect for meal prep or feeding a crowd.

What you’ll end up with is a creamy, satisfying bowl of soup that’s rich enough to feel indulgent but balanced enough for everyday meals.

The buttermilk adds a subtle tang that brightens the potatoes, while a sprinkle of chives or crispy bacon bits on top adds texture and visual appeal.

It’s the kind of soup that warms you from the inside out—ideal for chilly evenings or when you need a hearty meal without the heaviness of cream.

Serve with crusty bread for dipping or alongside a simple green salad to round out the meal. The recipe scales easily, so you can make a big batch for leftovers or share with neighbors.

Here’s how to make it—simple steps for a soup that tastes like it’s been simmering all day.

Ingredients for baked potato soup recipe without sour cream

Good potatoes, buttermilk, and a few pantry staples—this soup feels indulgent without the cream.

The potatoes are the star, so grab Russet—they’re starchier and hold up better to roasting. Organic if possible, but regular works fine. I usually buy a 5-pound bag and roast extras for snacks. For the buttermilk, full-fat is key—it adds richness without tang. If you don’t have it, mix 1.5 tablespoons lemon juice or vinegar with 1.5 cups milk and let sit 5 minutes. The broth? Low-sodium so you control the saltiness—store-bought is fine, but homemade tastes better. For the bacon bits, Trader Joe’s has pre-cooked ones that save time, or cook your own with thick-cut bacon.

No buttermilk? Coconut milk with a splash of vinegar works in a pinch (though texture will differ). Fresh chives wilt fast, so buy them last—Trader Joe’s has great bundles. The flour for the roux? Diamond Crystal kosher salt is my go-to, but any all-purpose works. If you’re avoiding gluten, swap the flour for cornstarch (use half the amount). For the onion, celery, and garlic, diced small ensures they melt into the soup without texture. The bacon bits are optional but add a smoky crunch—skip if you’re keeping it vegetarian.

This soup tastes even better the next day—4-5 days in the fridge, 3 months frozen. I portion it into containers for easy lunches. To reheat, warm on the stove over medium-low, stirring often. If it thickens too much, add a splash of broth. For extra richness, stir in a pat of butter at the end. Leftovers? Freeze in single portions for quick meals later.

Step-by-step instructions for creamy baked potato soup

Here's how to create velvety, comforting soup without a drop of sour cream.

In a large pot, combine the 3 lb Russet Potatoes (cut into 1-inch cubes with skin on) with the 6 cups Chicken Broth. Bring to a boil over medium-high heat, then reduce to a simmer and cook uncovered for 15-20 minutes until the potatoes are fork-tender—they should collapse easily when pierced with a fork. Don't skip the skin; it adds natural creaminess as it breaks down.

While the potatoes cook, I like to give them a gentle stir every 5 minutes to prevent them from sticking to the bottom. The broth should reduce slightly, concentrating the flavor. If it gets too low, add a splash of water to keep the potatoes submerged. You'll know they're done when the edges look soft and translucent, but the centers still have a slight resistance.

In a separate medium saucepan, melt the 4 tbsp Unsalted Butter over medium heat until it foams. Add the 0.25 cup All-Purpose Flour all at once and whisk continuously for 1-2 minutes until the mixture turns a pale golden color and smells nutty. This is your roux—the foundation of the soup's creaminess.

Here's the thing—don't walk away. The roux burns easily, and once it browns, it'll make your soup taste bitter. You want it smooth and pale, like wet sand. If it starts to darken too quickly, reduce the heat slightly. Once it's ready, immediately whisk in 1 cup of the hot potato cooking liquid to create a smooth paste. This prevents lumps that can make your soup grainy.

In a large skillet, melt 1 tbsp of the remaining butter over medium heat. Add the 1 whole Yellow Onion (diced small), 2 whole Celery Stalks (diced small), and 4 cloves Garlic Cloves (minced fine). Cook for 5-6 minutes, stirring occasionally, until the vegetables soften and the onion becomes translucent. You'll smell that sweet, savory aroma—this is where the soup gets its depth of flavor.

I like to press down on the vegetables with a wooden spoon during the last minute of cooking. This helps them release their juices and caramelize slightly, adding another layer of complexity to the soup. If the vegetables start to brown too quickly, reduce the heat to medium-low. Once they're tender and fragrant, transfer them to your pot with the potatoes and roux mixture.

Pour the 1.5 cups Buttermilk into the pot with the potatoes and roux mixture. Stir well to combine, then add the sautéed vegetables. Bring the soup to a gentle simmer over medium heat, then reduce to low heat and let it cook for 10-15 minutes, stirring occasionally. This slow simmer allows the flavors to meld together and the soup to thicken naturally to a creamy consistency.

Here's where the magic happens: the buttermilk adds tang and richness without needing sour cream. Taste the soup and adjust the seasoning with the 1.5 tsp Salt and 0.5 tsp Black Pepper. Remember, the broth might have been low-sodium, so you might need to add a bit more salt than you think. The soup should be velvety smooth with no lumps—if it's too thick, whisk in a splash of hot water or broth to reach your desired consistency.

Once the soup is creamy and well-seasoned, remove it from the heat. Ladle the soup into bowls and garnish each serving with 0.25 cup Fresh Chives (chopped) and a sprinkle of 0.25 cup Crispy Bacon Bits for a smoky contrast. The chives add a fresh, bright note that cuts through the richness, while the bacon bits give a satisfying crunch and salty depth.

Serve immediately while hot, with crusty bread on the side for dipping. The soup will continue to thicken slightly as it sits, so don't worry if it looks a bit thin when you first ladle it into the bowls. Each spoonful should deliver that comforting, creamy texture with layers of flavor from the potatoes, buttermilk, and aromatic vegetables. Trust me, you won't miss the sour cream!

Troubleshooting perfect results

Grainy Texture Fix

If your soup turns out grainy, it’s usually from either undercooked potatoes or improper roux technique. For the potatoes, always cut them into even 1-inch cubes and cook until they’re completely fork-tender—no resistance at the center. For the roux, whisk continuously until it’s a smooth, pale paste before adding liquid.

If lumps still appear, blend a small portion of the soup with an immersion blender until smooth, then stir it back in. 🥔

Too Thin or Watery

The soup might be too thin if you didn’t simmer it long enough or if the potatoes weren’t cooked down sufficiently. After adding the buttermilk, let it simmer for an extra 5-10 minutes to thicken naturally.

If it’s still too thin, mix 1 tbsp cornstarch with 2 tbsp cold water, stir it into the soup, and simmer for another 2-3 minutes. Avoid over-thickening—you want it creamy, not gluey.

Buttermilk Curdling

Buttermilk can curdle if added to hot soup too quickly. To prevent this, always stir the buttermilk into the soup while it’s still at a gentle simmer, not boiling. If you notice curdling, whisk vigorously and add a splash of hot broth to bring it back together.

For extra insurance, temper the buttermilk first by mixing ¼ cup of the hot soup into it before adding the full amount to the pot.

Weak or Bland Flavor

A bland soup usually means the vegetables weren’t cooked long enough or the seasoning was skipped.

Burnt Roux Ruins the Soup

A burnt roux will make your soup taste bitter and off-putting. To avoid this, keep the heat at medium-low while cooking the roux and whisk constantly. If it starts to darken, immediately whisk in a splash of hot broth to cool it down. For extra safety, use a light-colored roux (just pale golden) rather than a darker one. The goal is a smooth, nutty aroma—not a smoky one.

Potatoes Stay Too Firm

If your potatoes aren’t soft enough, they likely weren’t cooked long enough or were cut too large. Next time, cut them into slightly smaller cubes (¾ inch) and simmer for an extra 5-10 minutes.

You can also parboil them for 5 minutes before adding them to the broth to speed up the process. Always check for doneness by piercing with a fork—they should collapse easily with no resistance.

Frequently asked questions