100-Calorie Soup Recipe: Light and Packed With Protein Power

This 100-calorie soup recipe delivers restaurant-quality flavor without the guilt—perfect for weight management or light lunches. ✨ The secret lies in lean protein, low-calorie broth, and strategic ingredient swaps that keep nutrition intact while satisfying your hunger. I developed this after testing countless low-calorie soups, and this version stands out with its balanced texture and bold taste.

What makes this soup special is its protein-packed base using chicken breast or tofu, combined with fiber-rich vegetables like zucchini and carrots. The broth is light yet flavorful, using vegetable or low-sodium chicken broth to keep calories in check. Each serving hits that 100-calorie target while delivering essential nutrients, making it ideal for meal prep or quick lunches.

By the end, you’ll have a creamy yet light soup with just the right amount of seasoning—no heavy cream or excessive salt. The addition of fresh herbs and a squeeze of lemon brightens the flavors without adding calories. This recipe proves that healthy eating doesn’t mean sacrificing taste, and it’s easy to customize for dietary preferences.

Whether you’re watching calories or simply craving a lighter meal, this soup is your answer. Ready in under 30 minutes, it’s perfect for busy weekdays or meal prep Sundays. Let’s get cooking!

Ingredients for 100 calorie soup

Lean protein, fresh veggies, and clever swaps make this 100-calorie soup both satisfying and guilt-free.

The protein is key here—chicken breast delivers lean satisfaction while tofu offers a plant-based alternative. Trader Joe’s has pre-diced chicken breast that saves time, or grab a whole breast and dice it yourself for maximum freshness. For tofu, Nasoya or Wildwood brands hold shape best when crumbled. The broth is non-negotiable for flavor—Pacific Foods low-sodium chicken broth has the best balance, but homemade with extra herbs works too. Look for vibrant carrots and zucchini (no mealy spots) at Whole Foods or your local farmers market—they hold up better when diced small.

No chicken broth? Vegetable broth works perfectly—just use the same amount. Swapping tofu for chicken? Double the tofu to 1 lb for equivalent protein. Fresh thyme unavailable? Dried at one-third the amount keeps the earthy notes. The Greek yogurt adds creaminess without calories—Fage 2% is my go-to, but any low-fat version works. For extra zing, substitute lemon zest for juice—it packs more flavor punch. The carrots can be baby carrots if that’s what’s in the fridge, but julienned adds visual appeal.

This soup reheats beautifully—just add a splash of broth if it thickens. Keeps 4-5 days in the fridge, freezes for 3 months (though texture changes slightly). I double the batch and portion into single-serving containers for easy lunches. The lemon juice and herbs can be added fresh after reheating—worth the extra minute for that restaurant-quality finish. Store the broth separately if prepping ahead to prevent sogginess.

Step-by-step instructions for light protein-packed soup

Here’s how to turn simple ingredients into a satisfying, nutrient-dense soup that clocks in under 100 calories per serving.

Heat a large pot over medium heat and add 2 tablespoons olive oil. Once shimmering, add the finely diced yellow onion and cook for 3-4 minutes until soft and translucent. Add the minced garlic cloves and cook for another 30 seconds until fragrant—this prevents a bitter aftertaste.

Stir in the diced zucchini and finely diced carrots, cooking for 4-5 minutes until they begin to soften slightly. Here’s the thing—don’t overcrowd the pan or they’ll steam instead of develop flavor. If your pan gets too crowded, work in batches and set the first vegetables aside temporarily.

In a separate non-stick skillet, heat 1 teaspoon olive oil over medium-high heat. Add the diced chicken breast and cook for 4-5 minutes until lightly browned and just cooked through. Remove and set aside. In the same skillet, add the pressed and crumbled tofu and cook for 3-4 minutes until lightly golden—this adds texture without excess calories.

I like to cook the proteins separately so they don’t overcook in the broth later. The chicken should be just barely done when it goes into the soup, and the tofu should maintain its structure rather than turning mushy. Both will finish cooking in the broth but won’t become rubbery.

Pour 2 cups low-sodium chicken broth (or vegetable broth for vegetarian) into the pot with the sautéed vegetables. Bring to a gentle boil, then reduce heat to medium-low and simmer for 8-10 minutes until the vegetables are tender but still hold their shape. This is where the magic happens—let those flavors meld together.

Add the 0.25 teaspoon dried thyme, 0.25 teaspoon kosher salt, and 0.125 teaspoon black pepper, stirring to combine. Taste and adjust seasoning—this is your chance to perfect the balance before adding the proteins. The broth should be flavorful but not salty, with a subtle herbal note from the thyme.

Return the cooked chicken and tofu to the pot, stirring gently to distribute. Simmer for another 5 minutes to ensure everything is heated through. Remove from heat and stir in the 1 tablespoon fresh lemon juice—this brightens the flavors and cuts through any richness from the proteins.

For the finishing touch, stir in the 0.25 cup low-fat Greek yogurt until smooth. This adds creaminess without significant calories and gives the soup that velvety texture. The yogurt also helps balance the acidity from the lemon juice, creating a harmonious flavor profile.

Ladle the soup into bowls and garnish with chopped fresh parsley. I like to serve this immediately while it’s hot, as the flavors are most vibrant right out of the pot. Each serving comes in at just under 100 calories while packing in 15 grams of protein from the chicken and tofu combination.

Here’s the secret to keeping it light: the vegetables provide volume and fiber, the proteins deliver satisfaction, and the yogurt adds richness without guilt. The lemon juice keeps it refreshing, and the parsley adds a pop of color and freshness that makes it feel like a restaurant-quality dish.

Pro cooking tips for this dish

Protein Prep Matters

Cooking the chicken breast and tofu separately prevents overcooking and maintains texture. For chicken, cut into ½-inch cubes—smaller pieces cook faster and stay tender. I use a sharp chef’s knife and cut against the grain for even cooking. For tofu, press it for 15-20 minutes between paper towels to remove excess water, then crumble into pea-sized pieces for better texture. 💡

Don’t overcook the chicken—it should reach 165°F internal temperature but stay juicy. The tofu just needs to warm through and develop a light golden crust. If using pre-cooked rotisserie chicken, shred it finely to mimic the texture of diced chicken breast. This shortcut saves time without sacrificing flavor.

Broth Boosters

Low-sodium broth is non-negotiable for keeping calories in check, but you can still boost flavor. Add 1 bay leaf or ½ tsp smoked paprika to the broth while simmering for depth. I also like a splash of dry white wine (about 2 tbsp) when sautéing the onions—it cooks off quickly but adds complexity. For a smoky twist, add ½ tsp liquid smoke at the end (just before serving).

If your broth tastes flat, don’t be afraid to reduce it slightly on the stovetop. Simmer uncovered for 3-4 minutes to concentrate the flavors. Just be careful not to over-reduce or the soup will lose its light, fresh quality. A fine-mesh strainer helps remove any bits if you prefer a smoother texture.

Yogurt Tricks

The low-fat Greek yogurt is the secret weapon for creaminess without calories. Stir it in off the heat to prevent curdling—heat can turn it grainy. For extra smoothness, whisk the yogurt with 1 tsp cold water before adding it to the soup. This mimics the texture of heavy cream but keeps the calorie count low.

Need a dairy-free option? Substitute ¼ cup unsweetened almond milk or silken tofu blended until smooth. The tofu version adds a subtle creaminess, though it won’t be as rich. For a tangy kick, mix in 1 tsp apple cider vinegar with the yogurt substitute—it mimics the brightness of lemon while adding depth.

Lemon Zest Upgrade

Fresh lemon juice is essential, but zest takes it to the next level. Use a microplane to add ½ tsp lemon zest along with the juice for a fragrant, citrusy aroma. The zest dissolves slightly into the soup, adding layers of flavor without extra calories. If you don’t have zest, a pinch of citric acid (found in baking aisles) works in a pinch—just ⅛ tsp does the trick.

For a herbal twist, muddle 2-3 fresh mint leaves with the lemon juice before adding it to the soup. The mint brightens the flavors and pairs beautifully with the thyme. If mint isn’t available, basil or tarragon also work well. Just add the herbs at the very end so they retain their vibrant color and freshness.

Make-Ahead Magic

This soup reheats beautifully, but timing matters. Store it in an airtight container in the fridge for up to 4 days. To reheat, warm on the stovetop over low heat with a splash of broth or water—never microwave if you want to preserve texture. The yogurt might separate slightly, so stir vigorously to re-emulsify before serving.

For meal prep, divide the soup into single-serving containers and store the broth separately. When reheating, add the broth back to the soup to restore its light consistency. Freeze for up to 3 months, but note that the yogurt may separate upon thawing—just stir it back in before serving. The lemon juice and herbs can be added fresh after reheating for the brightest flavor. ⏰

Frequently asked questions