Sweet Potato Soup with Greek Yogurt

This creamy sweet potato soup transforms a sheet pan of roasted vegetables into a silky vegetarian dinner in 50 minutes, finished with tangy Greek yogurt, fresh parsley, and a little Aleppo pepper, if you like.

Roasted Vegetables Make This Soup Rich and Velvety

This roasted sweet potato soup takes a different path from the usual stovetop version: Sweet potatoes, red bell peppers, tomatoes, onion, and garlic roast together until tender and lightly browned. The oven does most of the work, concentrating their sweetness and adding savory depth before everything goes into the blender.

Sweet potatoes give the soup enough body to turn velvety without heavy cream. I use a high-speed blender for the smoothest finish, but an immersion blender works, too. A spoonful of tangy Greek yogurt, a drizzle of fruity olive oil, parsley, and a little Aleppo pepper balance the vegetables’ gentle sweetness.

The soup is vegetarian and comes together in 50 minutes, with only 15 minutes of prep. Serve it with warm, crusty bread for an easy weeknight dinner that feels particularly welcome when the weather turns cool.

Ingredients for Sweet Potato Soup

Roasting brings out the vegetables’ natural sweetness, while tomatoes, aromatics, and a few simple garnishes keep the finished soup balanced. Here are the flavor-makers:

• Sweet potatoes: Sweet potatoes give the soup its sunny color, naturally sweet flavor, and creamy body. Dice them as evenly as you can so they cook at the same rate.
• Red bell peppers: Roasting the peppers until lightly browned deepens their sweetness and adds a subtle smoky note.
• Tomatoes: Tomatoes bring welcome acidity, balancing the sweetness of the potatoes and peppers.
• Red onion and garlic: These aromatics give the soup its savory foundation. The garlic roasts in its skin until soft and mellow, then you simply squeeze it out before blending.
• Extra virgin olive oil: A generous drizzle of extra virgin olive oil helps the vegetables brown while adding richness and fruity flavor.
• Salt: A small amount seasons the vegetables before roasting. 
• Vegetable broth: Warm vegetable broth loosens the roasted vegetable purée to a silky, spoonable consistency while keeping the soup vegetarian.
• Greek yogurt: The yogurt is spooned on top rather than blended into the soup. Its cool, creamy tang contrasts with the sweet roasted vegetables. Use plain plant-based yogurt to make the soup vegan.
• Parsley: Fresh parsley adds color and a clean, herbal finish.
• Aleppo pepper or crushed red pepper flakes: An optional sprinkle of Aleppo pepper adds gentle heat and a fruity depth without overwhelming the soup.
• Crusty bread: Serve a thick slice alongside each bowl for dipping.

How to Make Sweet Potato Soup

Most of the work happens in the oven. Once the vegetables are tender and lightly browned, all that remains is blending the soup and adding the garnishes.

• Get ready. Preheat your oven to 425°F with a rack in the center. Line a baking sheet with parchment paper.
• Prepare the vegetables. Spread 2 diced sweet potatoes, 3 large seeded and quartered red bell peppers, 1 peeled and quartered red onion, 3 medium tomatoes, and 4 whole, unpeeled garlic cloves across the prepared baking sheet in a single layer. Drizzle with 1/4 cup extra virgin olive oil and season with 1/2 teaspoon salt.
• Roast the vegetables. Roast until everything is completely tender and lightly browned, about 35 minutes. Meanwhile, warm 3 cups of vegetable broth.
• Blend the soup. Squeeze the roasted garlic from its skin. Carefully transfer the vegetables to a high-speed blender and add about one-third of the warm broth. Pulse, then purée until smooth, gradually pouring in the remaining broth.
  When blending hot soup, remove the center cap from the blender lid so steam can escape and cover the opening loosely with a kitchen towel. If you are using an immersion blender, transfer the vegetables to a soup pot, add one-third of the broth, and blend while gradually streaming in the rest.
• Garnish and serve. Divide the soup among four bowls. Finish each serving with Greek yogurt, a drizzle of extra virgin olive oil, chopped parsley, and Aleppo pepper or crushed red pepper flakes, if you like. Serve with crusty bread.

Tips for Creamy Sweet Potato Soup 

• Give the vegetables room. Spread everything in a single layer so the vegetables roast and brown instead of steaming.
• Look for tenderness and browning. The sweet potatoes should be soft all the way through, and the vegetables should have lightly browned edges. That caramelization is where much of the soup’s depth comes from.
• Warm the broth. Adding warm broth helps the soup stay hot and makes it easier to blend evenly.
• Add the broth gradually. Starting with only one-third of the broth helps the blender break down the vegetables into a smooth purée. Stream in the remainder until the soup reaches an even, silky consistency.
• Blend safely. Never tightly seal steaming soup in a blender. Let the steam escape through the center opening, keep it loosely covered with a kitchen towel, and work in batches if your blender is too full.
• Strain it for an extra-silky finish. A high-speed blender should produce a smooth soup, but you can pass it through a fine-mesh sieve if you want to remove any remaining bits of pepper skin.

Ways to Garnish Sweet Potato Soup

The soup is flavorful as written, but you can change the garnishes to suit the meal: 

• Add a creamy finish: Add plain Greek yogurt or use plain plant-based yogurt for a vegan option.
• Add gentle heat: Sprinkle the soup with Aleppo pepper or crushed red pepper flakes.
• Give it some crunch: Top each bowl with crispy roasted chickpeas, crushed homemade pita chips, or roasted pumpkin seeds.
• Add a savory finish: Finish the soup with crumbled feta and a small sprinkle of za’atar.

What to Serve with Sweet Potato Soup

This silky soup is especially good with something crisp or crusty on the side. Serve it as a light main course or pair smaller bowls with a salad for a simple dinner. 

• For dipping, add warm No-Knead Olive Bread or Roasted Garlic Focaccia.
• For a fresh, crunchy contrast, serve the soup with Lemon Parmesan Lettuce Salad.
• To make the meal more substantial, add a scoop of herby Tabouli Salad.

Make Ahead and Storage

• Make ahead: Prepare and blend the soup as directed, but wait to add the yogurt and other garnishes. Refrigerate it in covered, shallow containers and reheat when you are ready to serve.
• Refrigerate: Store leftover sweet potato soup without the garnishes in a covered container for 3 to 4 days.
• Freeze: Freeze the ungarnished soup for 2 to 3 months. Thaw it overnight in the refrigerator before reheating.
• Reheat: Warm the soup in a saucepan, stirring frequently, and bring it to a boil. It may thicken as it sits, so add a splash of vegetable broth or water as needed. Spoon on the Greek yogurt and other garnishes just before serving.

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