Desserts
This low-fat sweet potato soup delivers all the comforting richness of traditional recipes without relying on heavy cream or excessive butter. The secret lies in blending roasted sweet potatoes with vegetable broth and a touch of Greek yogurt, creating a velvety texture that's both satisfying and diet-friendly.
I developed this version after years of testing lighter alternatives that never compromised on flavor—because healthy eating shouldn't mean sacrificing taste.
The foundation of this soup is simple yet transformative: roasting the sweet potatoes first intensifies their natural sweetness while developing deeper caramelized flavors. We then simmer them with low-sodium broth and aromatic vegetables, then blend until silky smooth.
The Greek yogurt adds creaminess without the fat, while a pinch of cinnamon and nutmeg elevates the soup to restaurant-quality comfort without guilt.
What you'll end up with is a soup that's velvety smooth yet light enough for any meal, packed with natural sweetness and warming spices. Each spoonful delivers the perfect balance of sweet and savory, with a texture that's impossibly creamy thanks to our clever substitutions.
The best part? It's ready in under an hour and scales perfectly for meal prep or feeding a crowd.
While this recipe is naturally low-fat, I've included optional vegan adaptations using coconut milk for those who prefer plant-based ingredients. The flavor remains consistent whether you use yogurt or coconut milk, proving that lighter versions can be just as delicious as traditional recipes.
Let's make this comforting soup that everyone will love.
Ingredients for low fat sweet potato soup
Roasted sweet potatoes, aromatic vegetables, and clever creaminess swaps make this light yet rich soup.
| Ingredient | Amount | Notes |
|---|---|---|
| Sweet Potatoes 🍠 | 3 lbs | Medium size, peeled and cubed |
| Vegetable Broth 💧 | 4 cups | Low-sodium preferred |
| Plain Greek Yogurt 🥛 | ½ cup | Non-fat for lowest fat content |
| Onion 🧅 | 1 whole | Yellow or white, diced |
| Garlic Cloves 🧄 | 4 cloves | Freshly minced |
| Carrot 🥕 | 2 whole | Medium size, peeled and chopped |
| Celery Stalks 🌿 | 2 whole | Trimmed and chopped |
| Ground Cinnamon 🌶️ | 1 tsp | Freshly ground preferred |
| Ground Nutmeg 🌶️ | ¼ tsp | Freshly grated for best flavor |
| Salt 🧂 | ½ tsp | Diamond Crystal kosher salt |
| Black Pepper 🌶️ | ¼ tsp | Freshly ground preferred |
| Extra-Virgin Olive Oil 🫒 | 1 tbsp | For roasting sweet potatoes |
| Fresh Thyme Leaves 🌿 | ¼ cup | Chopped, or 1 tsp dried |
| Coconut Milk (optional) 🥥 | ½ cup | Full-fat for vegan version |
The sweet potatoes are the star here—orange-fleshed varieties like Garnet roast up sweeter than purple types. Trader Joe's and Whole Foods carry the best selection, but any organic sweet potato at the grocery store works. Roasting them first brings out their natural sugars and caramelized depth, which is why I always do this step. Skip the peeling if you prefer—it adds fiber and nutrients. For a vegan version, swap the Greek yogurt for coconut milk at the end, but keep the yogurt for the creamy texture if you're not avoiding dairy.
No Greek yogurt? Silken tofu blended smooth works surprisingly well—just add a splash of broth to thin it out. Fresh thyme is ideal, but dried thyme at one-third the amount gets you close. The cinnamon and nutmeg are non-negotiable for that warm, cozy flavor, but if you're missing one, allspice or cardamom can step in. For the broth, low-sodium versions like Pacific Foods help control the seasoning. The olive oil? Use a fruity, peppery variety—California extra-virgin is my go-to, but any good quality oil will do. And if you're short on carrots or celery, frozen chopped veggies work in a pinch.
This soup reheats beautifully—just stir in a splash of broth or water if it thickens. Keeps in the fridge for 5 days sealed tightly, or freeze portions for 3 months. I always make a double batch because it's perfect for meal prep. The flavors actually improve overnight, so leftovers taste even better. For serving, a swirl of coconut milk or a dollop of Greek yogurt on top adds that restaurant-quality finish without extra fat. Garnish with fresh thyme or a sprinkle of cinnamon for a pop of color and flavor.
Why You'll Love This Recipe
- No-Fuss Prep: I swear by this recipe because it’s literally three steps: chop, simmer, blend. The onions and garlic caramelize right in the pot while the sweet potatoes soften—no peeling required if you’re in a rush. Honestly, I’ve made it while scrolling through my phone.
- Creamy Without the Guilt: That Greek yogurt swirl? It’s the secret weapon. The broth keeps it light, but the yogurt adds that velvety finish without a single drop of heavy cream. Between us, my kids ask for seconds and don’t even notice it’s low-fat.
- Lunchbox Magic: This soup is my meal prep MVP. It reheats beautifully—just a splash of broth to loosen it up—and tastes just as good cold the next day. Pack it in a thermos for work, or let it chill overnight for a refreshing twist. (Yes, even on a Tuesday night.)
- Budget-Friendly Comfort: Sweet potatoes and broth are staples that won’t break the bank, and a tub of Greek yogurt stretches across multiple recipes. I’ll be real: I’ve made this soup three times in a row when I’m pinching pennies, and it never gets old.
Step-by-step instructions for low fat sweet potato soup
Here's how to create a velvety, creamy soup without heavy cream or butter.
Roast the Sweet Potatoes and Vegetables for Depth of Flavor
Preheat your oven to 425°F. In a large bowl, toss the 3 lbs cubed sweet potatoes, 1 whole diced onion, 2 whole chopped carrots, and 2 whole chopped celery stalks with 1 tablespoon extra-virgin olive oil, 0.5 teaspoon salt, 0.25 teaspoon black pepper, 1 teaspoon ground cinnamon, and 0.25 teaspoon ground nutmeg. Spread everything evenly on two rimmed baking sheets.
Roast for 30-35 minutes, stirring once halfway through, until the sweet potatoes are tender when pierced with a fork and the edges are deep golden brown. The roasting caramelizes the natural sugars, creating a rich, sweet foundation for the soup. Don't skip this step—it's what transforms basic sweet potatoes into something extraordinary.
Build the Base with Aromatics and Broth
While the vegetables roast, heat a large Dutch oven or soup pot over medium heat. Add 4 cloves minced garlic and sauté for 30 seconds until fragrant—don't let it brown or it'll turn bitter. Immediately add 4 cups vegetable broth and bring to a gentle simmer.
Transfer the roasted sweet potatoes and vegetables to the pot. Stir well and add 0.25 cup chopped fresh thyme leaves. Let the mixture simmer uncovered for 10-12 minutes until the flavors meld together. You'll notice the soup developing a beautiful, aromatic steam—this is when the magic happens. If the soup seems too thick, add ½ cup water to reach your preferred consistency.
Create the Silky Texture with Greek Yogurt
Reduce heat to low and carefully stir in the 0.5 cup plain Greek yogurt using a wooden spoon. The yogurt will thicken the soup slightly and add a luxurious creaminess without the fat. If you're using the optional 0.5 cup coconut milk, add it now along with the yogurt. Stir gently to avoid creating lumps—this is where patience pays off.
Simmer for 5-7 minutes until the soup is completely smooth and velvety. Taste and adjust seasoning with more salt, black pepper, or cinnamon as needed. The yogurt should blend seamlessly, creating a texture that's rich but still light. If you prefer an even silkier consistency, blend the soup with an immersion blender for 10-15 seconds—just enough to break up any remaining chunks while keeping it rustic.
Finish and Serve with Fresh Herbs
Remove the pot from heat and let the soup rest for 5 minutes to allow the flavors to fully develop. Garnish each serving with a sprinkle of fresh thyme leaves and an extra pinch of ground cinnamon. The contrast between the warm spices and fresh herbs elevates the dish to restaurant-quality.
Serve immediately while warm, accompanied by crusty bread or a simple green salad. The soup should be thick enough to coat the back of a spoon but still easy to sip. If it thickens as it cools, simply stir in a splash of warm broth to restore the perfect consistency. This soup keeps well in the refrigerator for 3-4 days, making it an excellent make-ahead meal for busy weeknights.
Pro Tips For Making Low Fat Sweet Potato Soup
- ROAST THE POTATOES FIRST: Sweet potatoes taste sweeter and blend smoother when roasted whole at 400°F (200°C) for 45-50 minutes first—skip peeling if you want extra fiber. I learned this the hard way after pureeing raw cubes and ending up with a gummy mess.
- PEEL GARLIC AFTER MINCING: Crush the garlic cloves with the flat side of your knife before peeling—it’s easier to chop and less likely to slip. I was skeptical until I tried it; now I can’t go back.
- WHISK IN YOGURT LAST: Temper the Greek yogurt by mixing in a splash of hot soup first, then whisk in the rest. Adding it cold can curdle the soup, and nobody wants a lumpy low-fat version.
- SALT THE BROTH WELL: Vegetable broth is often bland—add ½ teaspoon salt per cup while heating, even if the recipe says otherwise. I skip this and always regret the lack of depth later.
Make-ahead tips for low fat sweet potato soup
Prep Ahead Strategy
Roast all your sweet potatoes and vegetables the night before—this step takes the most time and can be done entirely in advance. Store them in an airtight container in the fridge for up to 2 days.
When you're ready to cook, simply reheat them in the microwave for 3-4 minutes or transfer directly to your simmering pot. This saves you 30-45 minutes on busy weeknights while maintaining perfect flavor. 💡
Freezer-Friendly Technique
For maximum convenience, make the entire soup (up to Step 3) and freeze it in quart-sized freezer bags. Leave 1 inch headspace for expansion and label with the date. Thaw overnight in the fridge, then reheat on the stovetop with ½ cup additional broth to restore consistency.
The texture remains silky smooth after freezing—just stir vigorously when reheating to prevent separation. 🥶
Batch Cooking Tips
Double or triple the recipe for easy meal prep—this soup scales beautifully. Store in glass Pyrex containers with tight-sealing lids for up to 5 days in the fridge. I always make 8 servings at once so I have leftovers for lunches all week.
The flavors actually deepen overnight, making reheated portions taste even better than fresh. ✨
Garnish Prep Shortcut
Chop all your fresh thyme and measure your cinnamon/nutmeg the day before serving. Store them in small spice jars in your fridge—this saves 10 minutes of prep time when you're ready to serve. A quick sprinkle of these prepped garnishes adds that restaurant-quality finish without any last-minute fuss. 🌿
Reheating Perfection
For the creamiest reheated texture, warm the soup on the stovetop over low heat with a splash of warm broth or water. If using an immersion blender, pulse for 5-10 seconds to restore smoothness.
Avoid microwaving—it can create a skin and uneven heating. I find reheating on the stovetop preserves the velvety consistency best. 🔥
Portion Control Hack
Use 1-cup portion scoops when freezing individual servings. This ensures consistent portion sizes and makes reheating easier—just pop one portion in a bowl and warm it up. For dietary tracking, each 1-cup serving contains about 120 calories and 3g fat, making it perfect for meal planning. 📏
Nutrition facts
Frequently asked questions
Can I make this soup without Greek yogurt?
For a dairy-free version, blend ½ cup silken tofu with ¼ cup broth until smooth and stir it in at the end. Or use ½ cup coconut milk for a naturally creamy texture that works beautifully in this recipe. The key is adding the thickener at low heat to prevent curdling.
Why does my soup turn out watery?
Roasting the sweet potatoes first helps control thickness. If your soup is too thin, simmer uncovered for 5-10 extra minutes to reduce it naturally. For immediate thickening, stir in 1 tablespoon cornstarch mixed with 2 tablespoons cold water and simmer for 2 minutes until thickened. Avoid adding too much broth initially—start with 3 cups if you prefer a thicker base.
How can I make this soup spicier?
Add ½ teaspoon smoked paprika during roasting or ¼ teaspoon cayenne pepper at the end for heat. For depth, stir in 1 teaspoon chipotle powder with the spices. Balance with a pinch more cinnamon—it complements the spice beautifully while keeping the soup warm and comforting. Always taste as you go!
Can I use regular sweet potatoes instead of orange-fleshed?
Yes, but expect a slightly different texture and flavor. Purple sweet potatoes add earthy notes and a vibrant color, while orange varieties provide classic sweetness. For best results, roast them until very tender—their moisture content varies by type. If using purple, reduce the cinnamon slightly (by ¼ teaspoon**) to avoid overpowering the natural flavor.
Is this soup kid-friendly?
The natural sweetness of roasted sweet potatoes makes this a hit with kids. For picky eaters, blend until completely smooth and serve with a side of buttered bread or crackers for dipping. Skip the nutmeg if your child prefers milder flavors—just use extra cinnamon for warmth. The Greek yogurt adds protein, making it a balanced meal they'll actually enjoy.