Low-Calorie Spinach & Sweet Potato Soup for New-Year Clean Eating

Every January, after the confetti settles and the last cookie tin is (finally) empty, my kitchen quietly shifts into “reset” mode. I still want food that hugs me from the inside out—just without the post-holiday food-coma. That’s how this velvety, jewel-toned spinach and sweet-potato soup earned a permanent spot in my winter rotation. It’s silky, slightly sweet, vibrantly green, and clocks in at under 175 calories a cup—proof that “light” never has to mean “boring.”

I first threw it together on a snowy afternoon when the fridge held nothing but a forgotten bag of baby spinach and two knobbly sweet potatoes. Thirty minutes later I was curled up on the sofa, hands wrapped around a steaming mug, wondering why I hadn’t been eating this every single day of my life. Since then it’s become my edible New-Year resolution: a gentle, delicious nudge toward more plants, more color, more mindfulness. Whether you’re doing a full-on January reset or just craving a bowl of something that feels like a deep breath, this soup is here for you.

Ingredients You’ll Need

Sweet potatoes (about 1 ¼ lb/565 g): Look for firm, unblemished skins and bright orange flesh—deeper color means more antioxidants. Japanese sweet potatoes work too; they’re slightly sweeter and turn a gorgeous golden when blended.

Baby spinach (5 oz/140 g): Pre-washed bags save time, but grab a fresh bunch if the leaves look crisper. Sub mature spinach or baby kale in a pinch; both deliver leafy goodness with barely any calorie bump.

Our only added fat; a drizzle at the end amplifies carotenoid absorption, so don’t skip it. Avocado oil is a neutral swap.

Yellow onion & garlic: The aromatic backbone. A small shallot works for onion; garlic powder (½ tsp) can substitute in a hurry.

Low-sodium vegetable broth (4 cups): Keeping sodium low lets the sweet-sharp spinach flavor shine. If all you have is regular broth, taste before adding extra salt.

Fresh lemon juice: Brightens the earthy notes. Lime is lovely for a Thai twist; apple-cider vinegar works in half the amount.

Ground cumin & coriander: Warm, citrusy spices that flatter both vegetables without overwhelming. Curry powder is a fun swap—start with ½ tsp and add more to taste.

Crushed red-pepper flakes: Optional, but that whisper of heat keeps the soup from tasting too sweet. Smoked paprika is another great topper.

Salt & black pepper: Add gradually; sweet potatoes can take more seasoning than you expect.

How to Make Low-Calorie Spinach & Sweet Potato Soup for New-Year Clean Eating

Expert Tips

Variations to Try

• Carrot-ginger spin: Replace half the sweet potatoes with carrots and add 1 Tbsp grated fresh ginger in step 2.
• Coconut greens: Swap 1 cup broth for light coconut milk and finish with cilantro instead of lemon.
• Protein punch: Stir in a can of rinsed chickpeas during the wilt step for an extra 6 g plant protein per serving.
• Spicy Southwest: Add ½ tsp chipotle powder and top with roasted corn and avocado.
• Silky tofu swirl: Blend in 4 oz silken tofu with the potato for a protein-rich, ultra-creamy version.
• Zucchini boost: Dice 1 medium zucchini and simmer with potatoes for extra veggies without altering calories much.

Storage Tips

Refrigerator: Cool soup completely, transfer to airtight containers, and refrigerate up to 4 days. The flavors meld beautifully, making day-two bowls the best.

Freezer: Freeze in single-serve mason jars or silicone muffin trays for portioned cubes. Once solid, pop cubes into a zip bag; keeps 3 months. Thaw overnight in the fridge or reheat straight from frozen in a saucepan with a splash of broth.

Make-ahead: Chop sweet potatoes and onions the night before; store submerged in water to prevent browning. Spinach can be pre-washed and kept in a paper-towel-lined container. Dinner comes together in 15 minutes.

School/office lunch: Pour hot soup into a preheated thermos; it will stay warm up to 5 hours. Pack seeds or croutons separately to maintain crunch.

Frequently Asked Questions

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Low-Calorie Spinach & Sweet Potato Soup for New-Year Clean Eating

(4.9 from 127 reviews)

Prep

10 min

Cook

25 min

Servings

6

Ingredients

• 1 Tbsp extra-virgin olive oil
• 1 medium yellow onion, diced
• 2 garlic cloves, minced
• 1 ¼ lb sweet potatoes (about 2 medium), peeled & ½-inch dice
• ½ tsp ground cumin
• ½ tsp ground coriander
• Pinch crushed red-pepper flakes, optional
• 4 cups low-sodium vegetable broth
• 5 oz baby spinach (about 5 packed cups)
• 1 Tbsp fresh lemon juice, plus wedges to serve
• ¾ tsp kosher salt, more to taste
• ¼ tsp freshly ground black pepper

Instructions

1. Heat aromatics: Warm olive oil in a Dutch oven over medium heat. Add onion and sauté 4 minutes until translucent. Stir in garlic, cumin, coriander, and pepper flakes; cook 30 seconds.
2. Add potatoes & broth: Toss in sweet potatoes, ½ tsp salt, and the broth. Bring to a boil, reduce to a simmer, and cook 12 minutes until potatoes are very tender.
3. Blend for creaminess: Transfer 2 cups of soup to a blender, puree until smooth, and return to pot. (Or use an immersion blender for 5-second bursts.)
4. Wilt spinach: Bring soup to a gentle simmer. Add spinach in batches, stirring until wilted. Season with lemon juice, pepper, and additional salt if needed.
5. Serve: Ladle into bowls. Garnish with pumpkin seeds, yogurt swirl, or extra pepper flakes. Store leftovers as directed above.

Recipe Notes

Blending hot liquids can create steam pressure. Remove the center cap from the blender lid and cover with a folded towel to avoid splatters.

Nutrition (per 1 ½-cup serving)

168

Calories

4g

Protein

31g

Carbs

3g

Fat