Name: Keto Lasagna Soup Recipe
Prep time: 10 min
Cook time: 25 min
Total time: 35 min
Cuisine: Italian
Ingredients: 1 tbsp vegetable oil; 1 lb Italian sausage (ground); ½ lb lean ground beef; 1 medium white onion (chopped); 6 cloves garlic (minced); 2 tbsp tomato paste; 1 (14 oz) can crushed tomatoes; 2 cups tomato passata; 2 ½ cups chicken broth (low sodium); 1 tsp fennel seeds; 2 tsp Italian seasoning; 2 tsp onion powder; 1.5 tsp sea salt; ½ tsp black pepper; 8 oz mozzarella (shredded); ½ cup parmesan (grated); ½ cup fresh parsley (chopped); Extra parmesan (grated, for garnish); Extra parsley (chopped, for garnish)

I absolutely love sharing this Keto Lasagna Soup Recipe with anyone who’s looking for a comforting, hearty meal that doesn’t sacrifice flavor just because it’s low-carb. From the very first spoon, I was hooked by how it captures all the delicious essence of classic lasagna in a warm, cozy soup. It’s rich, savory, and filling without feeling heavy, and the way the cheeses melt into the broth is pure magic. I find it’s a perfect dish when I want something satisfying yet simple to prepare, especially when I’m craving Italian flavors but want to keep things keto-friendly.

Why You'll Love This Keto Lasagna Soup Recipe

One of the biggest reasons I keep coming back to this recipe is its incredible flavor profile. The blend of Italian sausage and ground beef perfectly balances savory and slightly spicy notes, while the fennel seeds and Italian seasoning add that classic lasagna herbaceous touch that makes every bite feel vibrant. The tomato base is rich but not overwhelming, giving the soup a bright, tangy depth that’s both comforting and exciting. Adding those melted mozzarella and parmesan cheeses at the end rounds everything out with creamy, gooey goodness that feels indulgent without the carbs.

Besides how amazing it tastes, I really appreciate how straightforward this Keto Lasagna Soup Recipe is to make. I’m not someone who loves spending hours in the kitchen during a busy week, so being able to get a delicious, hearty meal on the table in around 35 minutes is fantastic. It’s also great for feeding a crowd or meal-prepping since it makes 8 servings. I often serve it at casual family dinners, cozy fall evenings, or even when friends come over because it’s such a crowd-pleaser without needing a ton of fuss. It’s a wonderful way to enjoy all the lasagna flavor without the hassle of noodles or extra carbs.

Ingredients You'll Need

The image shows a top view of many clear and white bowls arranged neatly on a white marbled surface, each filled with different ingredients for a recipe. There are large bowls with bright red Italian sausage, coarse ground beef, deep red crushed tomatoes, and smooth dark red tomato puree, along with a white bowl containing golden oil. Smaller clear bowls hold varying amounts of yellow Parmesan cheese, shredded pale yellow mozzarella, chopped white onions, and finely chopped green parsley. Tiny clear bowls in the center contain dry spices like dark green Italian seasoning, light brown fennel seeds, and small piles of onion powder, salt, black pepper, and peeled white garlic cloves. Each ingredient is labeled with white text on a transparent background. The whole setup looks fresh and organized. photo taken with an iphone --ar 4:5 --v 7

The ingredient list for this Keto Lasagna Soup Recipe is deceptively simple but each component plays an essential role in building the layers of flavor, texture, and color. From the hearty meats to the fresh herbs and creamy cheeses, every ingredient contributes something special to the final dish.

Vegetable oil: Helps brown the meat without adding strong flavors.
Italian sausage (ground): Adds savory seasoning and a slight spiciness to the soup.

Lean ground beef: Provides rich meatiness and protein.
White onion (chopped): Brings sweetness and aromatic depth.
Garlic (minced): Infuses the soup with essential Italian flavor.
Tomato paste: Concentrates tomato flavor and thickens the broth.
Crushed tomatoes (14 oz can): Adds texture and natural acidity.
Tomato passata: Smooth tomato base for richness and color.
Chicken broth (low sodium): Forms the soup’s savory liquid foundation.
Fennel seeds: Introduces a subtle, sweet anise note reminiscent of classic lasagna sausage.

Italian seasoning: A blend of herbs that deepens flavor complexity.
Onion powder: Enhances onion flavor for more punch.
Sea salt: Balances and elevates all the flavors.
Black pepper: Adds a gentle heat and sharpness.
Mozzarella (shredded): Melts into creamy, stringy cheese goodness.
Parmesan (grated): Offers salty, nutty notes and richness.
Fresh parsley (chopped): Brightens and adds freshness when stirred in and as garnish.

Directions

Step 1: Heat a large pot over medium-high heat and pour in the vegetable oil. This helps prevent the meat from sticking and promotes even browning.

Step 2: Add the Italian sausage, lean ground beef, and chopped white onion into the pot. Break the meat apart with your spoon or spatula and stir continuously until the meat is fully browned and the onions are soft, about 7 to 8 minutes.

Step 3: Toss in the minced garlic and sauté everything together for about 1 minute. This releases the garlic’s fragrant oils without burning.

Step 4: Stir in the tomato paste, canned crushed tomatoes, tomato passata, and chicken broth. Then sprinkle in the fennel seeds, Italian seasoning, onion powder, sea salt, and black pepper. Mix everything thoroughly so all the flavors blend.

Step 5: Bring the soup to a boil, then reduce the heat to low and let it simmer gently for about 20 minutes. This gives the flavors time to meld and the soup to thicken slightly.

Step 6: Remove the pot from heat and immediately stir in the shredded mozzarella, grated parmesan, and chopped parsley. The cheeses will melt into the soup, creating a luscious texture.

Step 7: Ladle the soup into bowls and garnish with extra parmesan and parsley for a fresh, pretty finish before serving.

Servings and Timing

This Keto Lasagna Soup Recipe yields about 8 generous servings, making it perfect for family meals or leftovers to enjoy throughout the week. Prep time is roughly 10 minutes, mostly for chopping and gathering ingredients. The cooking time clocks in at about 25 minutes from browning the meat to finishing the simmer, giving a total time of approximately 35 minutes. There’s no additional resting time required, so you can serve it piping hot right after stirring in the cheese.

How to Serve This Keto Lasagna Soup Recipe

A white bowl filled with a thick, bright red tomato-based sauce layered with melted yellow and white cheese mixed with small crumbles of browned meat. The dish is garnished with small green herb pieces scattered on top. A silver spoon is scooping up a portion of the cheesy meat mixture from the center, showing its rich and creamy texture against the white marbled surface background. photo taken with an iphone --ar 4:5 --v 7

I love serving this soup steaming hot as the centerpiece of a cozy dinner. It’s fantastic on its own or paired with crisp keto-friendly side salads to add some fresh contrast. A simple arugula salad dressed with lemon and olive oil or a Caesar salad with crunchy Parmesan crisps complements the rich soup beautifully. For some extra texture, I’ll sometimes bake up parmesan crisps or garlic-infused keto breadsticks to dunk into the soup and soak up all that delicious broth.

Presentation-wise, I like to garnish each bowl with a little extra grated parmesan and fresh chopped parsley—you really don’t want to skip the parsley since it adds a pop of color and a lovely herbal brightness that lifts the richness. If I’m making this for guests, I’ll serve it in wide, shallow bowls so there’s plenty of surface area for the cheese to shine. For beverages, I find a chilled dry white wine like Pinot Grigio or a sparkling water with lemon pairs perfectly, especially if you want something light to balance the soup’s creamy heartiness.

This recipe shines at any occasion from a casual weeknight meal to a relaxed holiday dinner or a potluck where you want to impress without spending hours cooking. I always tell friends it’s best enjoyed warm and fresh from the stove—though leftovers reheat beautifully if you want to plan ahead. Serving it in moderate portions works well since it’s quite filling, so about one and a half cups per person usually does the trick for a satisfying main course.

Variations

One of the things I find really fun about this Keto Lasagna Soup Recipe is how easy it is to adapt to suit different tastes or dietary needs. For instance, you can swap the Italian sausage for ground turkey or chicken to reduce fat content but still enjoy great flavor. If you want to change up the herb profile, fresh basil or oregano can be fresh twists that keep it feeling lasagna-inspired but new.

If you’re following a strict gluten-free or dairy-free keto plan, you can make a few smart adjustments too. Using a dairy-free mozzarella alternative and nutritional yeast in place of parmesan still gives that cheesiness without the dairy. Just be sure to choose a tomato passata and broth without any hidden gluten ingredients. For a vegan take, although it’s a bit of a departure, using plant-based crumbles and vegan cheeses can replicate the spirit of the soup while sticking to your preferences.

I’ve also experimented with slow cooker versions for days when I have more time. You can brown the meat first, then dump everything into the slow cooker and cook on low for 4 to 6 hours. Add the cheeses at the end just before serving so they melt perfectly. This method makes the flavors even deeper and is perfect for busy days when you want dinner waiting for you.

Storage and Reheating

Storing Leftovers

I always keep leftover Keto Lasagna Soup in airtight containers in the fridge. Glass containers with tight-fitting lids work best to preserve freshness and prevent any absorption of fridge odors. The soup will stay delicious for up to 4 days. I recommend letting it cool to room temperature before refrigerating to avoid sogginess and retain the best texture.

Freezing

This soup freezes well if you want to save some for later. I suggest portioning it into freezer-safe containers or heavy-duty zip-top bags, leaving some space for expansion. It can be frozen for up to 3 months. When freezing, hold off on adding fresh herbs and cheese until reheating for the best flavor and texture.

Reheating

The best way to reheat is gently on the stovetop over medium-low heat. Stir frequently to prevent sticking and break up any clumps of solidified cheese or fat. Avoid microwaving directly from frozen as it can heat unevenly. When reheating, add a splash of broth or water if the soup feels too thick. Once warmed through, stir in a little fresh parmesan or parsley to brighten it up again.

FAQs

Can I make this Keto Lasagna Soup Recipe ahead of time?

Absolutely! This soup actually tastes even better the next day as the flavors meld. You can prepare it fully, then store it in the fridge and reheat gently before serving.

Is this soup suitable for a strict keto diet?

Yes, it’s designed to be low-carb and keto-friendly by using meat, cheese, and low-carb tomato products. Just be sure to check the labels on your tomato passata and broth to avoid added sugars.

Can I use other types of cheese in this soup?

Definitely. While mozzarella and parmesan are traditional, you can try provolone, fontina, or even a sharp cheddar for a different flavor twist. Just keep in mind they will alter the classic lasagna taste slightly.

What if I don’t have fennel seeds? Any substitutes?

If you don’t have fennel seeds, crushed fennel pollen or a pinch of anise seed will work in a pinch. Otherwise, increase the Italian seasoning and maybe add a bit of dried oregano or basil to keep that herbal balance.

Can this recipe be made in an Instant Pot?

Yes, you can brown the meat using the sauté function, then add all the ingredients and pressure cook on high for about 10 minutes. Finish with the cheeses and parsley just like in the stovetop method.

Conclusion

I can’t recommend this Keto Lasagna Soup Recipe enough if you’re craving those rich, comforting Italian flavors without the carbs of traditional lasagna. It’s become one of my absolute favorites for its ease, warmth, and satisfying layers of taste. Whether you’re cooking for yourself, your family, or friends, this soup is sure to impress and nourish everyone around your table. Give it a try—you’ll likely find yourself making it again and again!