Roasted Sweet Potato Soup Recipe (Creamy Carrot and Red Onion)

Be the first to rate this recipe!0.0 from 0 votes

This roasted sweet potato soup recipe is velvety, naturally sweet and full of cozy fall flavor. Cubes of sweet potato, carrots, red onion and whole garlic cloves roast until caramelized at the edges, then blend with vegetable broth and warm spices into a silky, bright orange soup. A swirl of cream or coconut milk, a sprinkle of fresh parsley and a pinch of chili flakes finish each bowl.

Roasting is the secret. It concentrates the natural sugars and adds a deep, slightly smoky sweetness you simply cannot get from boiling. It takes about 15 minutes of prep and the oven does most of the work.

Why You’ll Love This Sweet Potato Soup Recipe

• Deep, caramelized flavor: roasting brings out the sweetness of every vegetable.
• Silky without much cream: sweet potatoes blend naturally creamy.
• Simple vegetables: sweet potatoes, carrots, red onion and garlic.
• Easy to make vegan: make it a sweet potato soup with coconut milk and vegetable broth.
• Meal prep friendly: it keeps well in the fridge and freezer.
• Beautiful color: bright orange and perfect for fall and holiday tables.

Ingredients for Sweet Potato Soup Recipe

For Roasting

• 2 large sweet potatoes: about 2 pounds (900 g), peeled and cut into 1-inch cubes.
• 2 carrots: peeled and chopped into 1-inch pieces.
• 1 large red onion: peeled and quartered.
• 4 cloves garlic: peeled and left whole.
• 2 tablespoons olive oil.
• 1 teaspoon smoked paprika.
• 1/2 teaspoon ground cumin.
• 1 teaspoon salt and 1/2 teaspoon black pepper.

For the Soup

• 4 cups (960 ml) vegetable broth: or chicken broth; plus more to thin.
• 1/2 teaspoon ground cinnamon or nutmeg (optional): a gentle warm note.
• 1 tablespoon lemon juice or apple cider vinegar: brightens the flavor.
• 1/2 cup (120 ml) heavy cream or canned coconut milk: some stirred in and some for swirling on top.

To Serve

• Fresh chopped parsley, a pinch of red chili flakes, toasted pumpkin seeds or crusty bread.

How to Make This Sweet Potato Soup Recipe

Heat the oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper.

Step 1: Roast the Vegetables

1. Spread the sweet potatoes, carrots, red onion quarters and garlic on the baking sheet.
2. Drizzle with the olive oil, sprinkle with smoked paprika, cumin, salt and pepper, and toss to coat. Spread in a single layer with a little space so the vegetables roast instead of steam.
3. Roast for 35 to 40 minutes, flipping halfway, until fork-tender and browned at the edges.

Step 2: Simmer

1. Transfer the roasted vegetables to a large pot. Add the broth and cinnamon or nutmeg, if using.
2. Bring to a simmer over medium heat and cook for 10 minutes so the flavors blend.

Step 3: Blend Until Silky

1. Blend with an immersion blender until completely smooth. Or blend in batches in a countertop blender, filling it no more than half full, venting the lid and covering it with a towel.
2. Stir in most of the cream or coconut milk and the lemon juice. Add more broth if you prefer a thinner soup. Taste and adjust the salt and pepper.

Step 4: Serve

1. Ladle into bowls, swirl in the remaining cream or coconut milk and top with parsley and a pinch of chili flakes.

Tips for the Best Sweet Potato Soup Recipe

Cut Even Pieces

Similar-sized cubes roast evenly, so nothing burns while other pieces are still firm.

Do Not Crowd the Pan

Use two sheets if needed. Crowded vegetables release moisture and steam, losing that caramelized flavor.

Choose Good Sweet Potatoes

Look for firm sweet potatoes with smooth skin and no soft spots. University of Nebraska-Lincoln Extension shares how to select and store sweet potatoes so they stay fresh until you cook them.

Balance the Sweetness

A splash of lemon juice or vinegar at the end wakes up the flavors and keeps the soup from tasting flat.

Carrot Sweet Potato Soup Variations

• Coconut curry: add 1 tablespoon curry powder and use coconut milk.
• Ginger: roast a 1-inch piece of peeled fresh ginger with the vegetables.
• Smoky heat: add a pinch of cayenne or chipotle powder.
• Apple: roast a cored, quartered apple with the vegetables for a fruity sweetness.
• Extra protein: blend in a can of drained white beans.

Why Roast the Vegetables First?

Boiled vegetables taste clean and mild, but roasting at high heat browns their surfaces and caramelizes their natural sugars. Sweet potatoes turn richer and almost honey-like, carrots deepen in flavor and the red onion and garlic become soft, mellow and sweet. When everything is blended, those browned bits give the soup a depth that usually takes hours of simmering.

Roasting also drives off some water, so the soup is naturally thick and silky without needing flour or lots of cream. The smoked paprika and cumin toast on the pan as well, adding gentle warmth and a hint of smokiness that balances the sweetness.

Sweet Potato Carrot Soup Garnish Ideas

• A swirl of cream, coconut milk, plain yogurt or sour cream.
• Fresh parsley, cilantro or chives for color.
• Red chili flakes or a drizzle of chili oil for heat.
• Toasted pumpkin seeds, crispy chickpeas or croutons for crunch.
• A drizzle of good olive oil and a few grinds of black pepper.

Equipment You Need

A large rimmed baking sheet, parchment paper, a big soup pot and an immersion blender are all you need. A countertop blender works too; blend in small batches and vent the lid so the hot soup does not build pressure.

What to Serve With Sweet Potato Soup

Serve this sweet potato soup recipe with crusty bread, a grilled cheese sandwich or a crisp green salad. For a cozy soup night, set it out next to a pot of creamy broccoli cheddar soup or hearty French lentil soup.

Still have sweet potatoes? Try our stuffed sweet potatoes for dinner, or bake a dish of Southern candied yams for the holiday table.

Make Ahead, Storage and Freezing

Make ahead: Roast the vegetables up to 2 days ahead and refrigerate, then simmer and blend when ready. The finished soup tastes even better the next day.

Fridge: Cool the soup and refrigerate in airtight containers within 2 hours. It keeps for 4 to 5 days. Reheat on the stove until hot all the way through, following basic safe food handling practices.

Freezer: Freeze for up to 3 months, ideally before adding cream. Thaw overnight in the fridge, reheat gently and stir in the cream or coconut milk.

Choosing the Best Sweet Potatoes for Soup

Orange-fleshed sweet potatoes give this soup its bright color and naturally sweet flavor. Varieties with deep orange flesh blend the smoothest. Purple or white sweet potatoes also work, though the soup will be paler and a bit starchier. In US stores, the orange roots sometimes labeled yams are a type of sweet potato too, so either label is fine here.

Large, evenly shaped sweet potatoes are easier to peel and cube. Two large ones weigh about 2 pounds; if yours are small, use three or four.

Frequently Asked Questions

Can I make sweet potato soup without roasting?

Yes. Saute the onion and garlic in olive oil, add the raw vegetables, broth and spices and simmer 20 to 25 minutes until tender, then blend. The flavor will be milder and less caramelized.

Is roasted sweet potato soup vegan?

It is when you use vegetable broth and coconut milk instead of cream.

Should I peel the sweet potatoes?

Peeling gives the smoothest, brightest soup. Well-scrubbed skins can be left on for a more rustic texture.

How do I make it thicker or thinner?

For thicker soup, use less broth or simmer uncovered for a few minutes. For thinner soup, stir in more warm broth a little at a time.

Can I use a slow cooker?

You can simmer the roasted vegetables with the broth in a slow cooker on low for 2 to 3 hours, then blend. Roasting first still gives the best flavor.

Be the first to rate this recipe!0.0 from 0 votes