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Instant Pot Easy Keto Lasagna Soup

Keto lasagna soup with all the warm, cheesy comfort of the classic — 5.7g net carbs and 20.8g protein per serving. My Instant Pot pulls it together in under 30 minutes for filling weeknight dinners.
  • 5.7gnet carbs
  • 20.8gprotein
  • 15minutes
  • 6servings

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I started making this keto lasagna soup because I wanted the flavors of my classic keto lasagna without spending an hour layering noodles and waiting for the oven. The Instant Pot version gives me all of that richness in about 30 minutes counting pressure build and release, and my family honestly can not tell the difference once the ricotta hits the bowl.

The real discovery was finding the right noodle. I tried regular shirataki (the kind that's pure konjac) and they turned rubbery after pressure cooking. Then I switched to Zeroodle penne by Liviva, which blends oat fiber with konjac, and the texture completely changed. They stay firm, hold sauce, and actually feel like pasta in a spoonful of soup. That swap made the whole recipe work for me.

The base is simple: ground beef browned with onion, celery, and garlic right in the Instant Pot liner. I add diced tomatoes, tomato paste, Worcestershire sauce, and Italian seasoning, then pour in chicken broth and the shirataki penne. Five minutes at high pressure and it is done. The vegetables stay intact, the beef is tender, and the broth has this deep, slow-simmered flavor even though the actual cook time is barely anything.

What makes this feel like real lasagna is the cheese. I drop a big spoonful of ricotta into each hot bowl right before serving, then pile mozzarella on top. The ricotta melts into the broth and creates this creamy layer that hits like a bite of actual lasagna. I have tried baking cheese on top in the oven, but stirring ricotta into the hot soup gives me better creaminess every time.

If you like Italian comfort food on keto, this sits right alongside my keto skillet lasagna and keto zucchini lasagna as a weeknight rotation staple. It is also the kind of recipe that scales up well for meal prep. I have made double batches and portioned them out for the week, and the flavor actually gets better on day two once the broth soaks into everything. For another low carb Italian comfort recipe, try my keto baked ziti.

Two Notes Before You Cook

warm bowl of keto lasagna soup with parsley and topped with ricotta cheese

If you want to trim the carbs a little, skip the tomato paste. It is there to deepen the tomato flavor of the broth.

Leftovers keep in an airtight container in the fridge for up to 4 days.

keto noodles in a colander

Penne is my favorite shape, but rice or spaghetti shirataki noodles work in this soup too.

How to Make Keto Lasagna Soup in the Instant Pot

The key to this soup is getting the pressure timing right. I use 5 minutes on high pressure with a 10 minute natural release. That is the exact window I have found that keeps the celery and onion from turning to mush while fully cooking the beef through. If you let it go to full natural release, the vegetables lose their bite.

One thing I always do: rinse the shirataki noodles under cold water for a full minute before adding them. Straight out of the bag they have that faint smell, but a good rinse takes care of it completely. I drain them, toss them into the pot with the broth, and they are ready.

If you do not have an Instant Pot, you can make this on the stovetop. Brown the beef the same way, add everything to the pot, bring it to a boil, then simmer for 20-25 minutes. The flavor is just as good, it just takes a bit longer. For more keto soup ideas, my slow cooker keto taco soup is another favorite, and my keto Italian beef stew scratches a similar itch when I want something heartier.

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The recipe

Instant Pot Easy Keto Lasagna Soup

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Prep 5 min Cook 10 min Total 15 min Serves 6

Ingredients

Servings 6

Instant Pot Easy Keto Lasagna Soup Ingredients

Step by Step Instructions

  1. Brown ground beef

    Add olive oil, ground beef, onion, celery and garlic to the Instant Pot liner. Select the saute function on the pressure cooker and cook for 3-4 minutes, until the meat is no longer pink.

    ground beef and celery cooking on saute mode in the instant pot
  2. Add tomatoes and seasonings

    Add diced tomatoes, tomato paste, worcestershire sauce, salt, italian seasoning, bay leaf, and pepper. Stir to combine.

    tomatoes mixed in with ground beef in a pressure cooker
  3. Add chicken broth and pasta

    Stir in chicken broth and shirataki pasta.

    shirataki noodles added to soup in instant pot
  4. Pressure cook

    Secure the lid and pressure cook on high for 5 minutes. make sure the valve is set to seal. When the cooking time is finished, let the pressure release naturally for 10 minutes before releasing the remaining pressure manually. Move valve to vent to manually release pressure.

    instant pot set to pressure cook high for 5 minutes
  5. Top with cheese

    Serve the lasagna soup and top with ricotta and mozzarella cheese.

    dollup of ricotta cheese and mozzarella cheese sprinkled on keto lasagna soup in a bowl

Nutrition

Per serving: 1 bowl

Calories
363
Fat
26g
Protein
20.8g
Total carbs
7.4g
Net carbs
5.7g

Nutrition is an estimate calculated from the ingredients listed. Brands vary, so check labels if you track closely.

Frequently Asked Questions

How many net carbs are in keto lasagna soup?

Each bowl of mine comes out to roughly 5.7g net carbs, or a little more depending on how generous I am with the cheese on top. The shirataki penne adds almost nothing, so the carbs come mainly from the tomatoes, onion, and celery. I track mine in Cronometer and it consistently lands in that range.

Can I make this in a slow cooker instead of the Instant Pot?

I have made this both ways. For the slow cooker, I brown the beef on the stovetop first, then dump everything into the slow cooker and cook on low for 4-6 hours or high for 2-3 hours. I add the shirataki noodles in the last 30 minutes so they do not get too soft. The broth ends up slightly richer from the longer simmer, which I actually prefer when I have the time.

What can I use instead of shirataki noodles?

I have tested this with both shirataki penne and cauliflower rice. Cauliflower rice works, but it changes the soup from noodle-forward to more of a chunky, stew-like texture. My family prefers the penne version, but if shirataki is not your thing, cauliflower rice is the best low carb swap I have found. You could also try my keto spaghetti noodle approach with hearts of palm if you want something closer to real pasta.

Can I freeze this soup?

I freeze this all the time. It keeps for up to 2 months in the freezer. I portion it into individual containers so I can grab one for lunch. The only thing I do differently is hold the ricotta and mozzarella out of the containers I am freezing, then add fresh cheese when I reheat. The broth and beef freeze beautifully.

Can I use Italian sausage instead of ground beef?

I have made this with both, and Italian sausage gives it a completely different (better, in my opinion) flavor. The fennel and red pepper flake in the sausage add a depth that ground beef alone does not have. I use hot Italian sausage, remove the casings, and brown it the same way. If you like keto comfort soups with more punch, try my keto cheeseburger soup too.

How do I reheat leftovers without losing texture?

I reheat mine on the stovetop over medium-low heat with a splash of extra chicken broth. The soup thickens in the fridge as the broth absorbs, so that extra liquid brings it back. Microwave works in a pinch, but I find stovetop keeps the noodles from getting chewy. I always add fresh ricotta on top after reheating, not before.

Do shirataki noodles get mushy in the Instant Pot?

Not if you use the right kind. I specifically use Zeroodle penne by Liviva because it is an oat fiber and konjac blend, not pure konjac. Pure konjac noodles turn rubbery under pressure, which I learned the hard way. The oat fiber blend holds its shape and actually has a slight chew to it that works in soup. Rinse them well before adding and they come out perfect.

Can I make this dairy-free?

I have made a version without cheese for a friend who is dairy-free. I skip the ricotta and mozzarella entirely and stir in a tablespoon of nutritional yeast at the end for a subtle cheesy flavor. It is not the same as the full cheese version, but the broth is so flavorful on its own that it still works as a satisfying bowl.

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Reviews

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4.8 from 21 ratings, 9 written

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Replying to Annie Lampella

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Lisa

Give the Instant Pot’s saute mode a good few minutes to preheat before adding the beef. I skipped it my first try and the meat cooked grey instead of browning, you could taste it in the final soup. Second time I waited for the HOT indicator and it was noticeably better. I’ve barely touched my IP since I got it two years ago, so I was nervous this would end in a mess, but browning to bowl was under 30 minutes. The ricotta nearly didn’t make it in. I figured cheese in brothy soup would be weird, but stirred a spoonful in and it just worked. Quick question: has anyone made this on the stovetop for a friend without a pressure cooker?

Reply

Annie Lampella

Lisa, stovetop works. I’d use a Dutch oven, same order: brown the beef, soften the onion and celery, then add the tomatoes, paste, broth, and seasonings. 20-25 minutes on medium-low. Add the shirataki right at the end.

Reply

Lisa

Dutch oven is what she has, sending it now!

Reply

Crystal

This has become my go-to weeknight IP dinner. Made it probably six times now. The Worcestershire sauce was the surprise; it adds depth that makes the broth taste like it simmered for hours instead of five minutes. One honest note: the Italian seasoning listed is the floor, not the ceiling. At the recipe amount it’s good, but I bumped it up to a full tablespoon and a half with a small pinch of red pepper flakes, and it just clicked. Worth knowing if you like your Italian food with some backbone. Solid enough to reward tinkering.

Reply

Annie Lampella

The Italian seasoning floor call is real. I go closer to a tablespoon and a half too, and it depends a lot on the brand – some go stale and a full tablespoon barely registers. The Worcestershire is what surprised me when I was testing (sounds completely wrong for soup, but it’s why the broth tastes like it went low and slow instead of like a quick weeknight shortcut). Red pepper flakes make sense here especially with ground beef. The sausage version has that heat baked in already but beef needs a little help.

Reply

Valerie

One thing that will make or break this if you’re new to shirataki pasta: rinse them really well, pat them dry, and do a quick dry toast in a hot pan before they go in. I did not do any of that my first time and there was this strange smell coming out of the pot that nearly made me scrap the whole thing. Turns out that’s just what unprepped shirataki does. Completely avoidable once you know. Second batch, five minutes under pressure, and the broth smelled exactly like a pot of lasagna filling had been going all afternoon. The ricotta and mozzarella spooned right on top while it’s still steaming is not optional in my book. That melty layer is what makes this feel like real lasagna and not just soup with beef in it.

Reply

Annie Lampella

That smell on first use is jarring. The dry pan step is the one most people skip and then can’t figure out what went wrong. I also switched to Zeroodle penne specifically (oat fiber and konjac blend, not pure konjac) and it’s way more neutral straight out of the bag.

Reply

Paul

My mom made lasagna every Sunday. Didn’t think I’d ever get that feeling back on keto. The ricotta hit different.

Reply

Annie Lampella

That ricotta swirl is what makes it taste like actual lasagna to me. Almost cut it when I was testing.

Reply

Rita

My husband doesn’t usually comment on weeknight meals, but after this he asked when I was making it again. The ricotta is what won him over, I think. I left a small bowl on the table and he kept adding more to his serving. Going into the rotation.

Reply

Annie Lampella

Smart leaving the bowl out. Mine never makes it back to the fridge either.

Reply

Renee

I was not sold on the idea of soup passing for lasagna, I’ll be honest. Made it anyway because I had ground beef I needed to use up and the shirataki noodles were the part I kept hesitating over. They kind of fade into the broth (in a good way) and the ricotta on top is what actually ties everything together. Wasn’t expecting that. Going in the rotation.

Reply

Annie Lampella

The ricotta surprise gets people every time. Glad the ground beef needed using up.

Reply

David

Threw a parmesan rind in the broth before sealing the lid and it came out way deeper than I expected from 5 minutes.

Reply

Annie Lampella

The rind does something the actual cheese doesn’t. I keep a bag of them in the freezer just for this.

Reply

Vanessa L.

The soup itself is solid, but I wish someone had warned me to rinse and dry the shirataki noodles first. Skipped that step and ended up with a fishy smell that took a few minutes to cook off. Next batch I’ll get it right.

Reply

Annie Lampella

Yeah, should be in my notes. Rinse, pat dry, then 2 minutes in a dry pan and the smell is gone.

Reply

Tamika

I went keto almost a year ago thinking lasagna was just… done for me. Made peace with it. Then I tried this on a random weeknight and when I stirred the ricotta into the broth and took that first bite, it stopped me cold. That flavor brought back every Sunday at my mom’s table. I didn’t expect a soup to do that to me, but here we are.

Reply

Annie Lampella

That ricotta stir-in is the whole recipe. It doesn’t fully melt so you get these little pockets in each bite – I almost blended it in at the start and I’m really glad I didn’t.

Reply

Taylor

Used spicy Italian sausage instead of ground beef (it’s what I had) and stirred the ricotta into the broth at the end instead of putting it on top. Got so thick and creamy. Obsessed with this soup now.

Reply

Annie Lampella

Spicy sausage is my preference over plain beef, the fennel and heat carry through the whole bowl. The ricotta stirred in instead of on top, I’ve started doing that too. Distributes better.

Reply

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