Instant Pot lasagna soup gives you all the comfort of baked lasagna without the layering, oven time, or cleanup. The broth turns rich and tomato-forward, the noodles cook right in the pot, and the sausage makes it hearty enough to stand on its own. What you get in the bowl is spoonable comfort with the same cozy mix of ricotta, mozzarella, and parmesan you’d want from a pan of lasagna.
The trick is building flavor before the pressure lid goes on. Browning the sausage first matters because that fat carries the seasoning, and a quick sauté with onion, garlic, and tomato paste deepens the base so the soup doesn’t taste flat. The broken noodles go in under the liquid so they cook evenly instead of drying out on top.
Below, I’ll show you how to keep the noodles tender, not mushy, and how to adjust the broth so the soup lands exactly where you want it — thick and hearty or a little looser for dipping bread.
The broth was rich and the noodles stayed perfectly tender after the quick release. I loved that the cheese dollop melted into the soup instead of turning stringy, and my kids asked for seconds.
Save this Instant Pot lasagna soup for the nights when you want all the lasagna flavor without baking a whole pan.
The Noodles Only Behave If They Stay Submerged
Lasagna noodles are the part that usually goes wrong in soup. If they sit on top of the liquid, they cook unevenly and turn leathery in spots. If they cook too long, they lose that lasagna texture and start falling apart. Pressing them under the broth before sealing the pot keeps them in contact with the hot liquid from the start, which is why they come out tender instead of ragged.
The other detail that matters is the quick release. With pasta in the pot, natural release is too much extra time. Those noodles keep cooking even after the burner shuts off, and that’s how you end up with a thick, over-soft mess instead of soup with body.
What Each Ingredient Is Actually Doing in This Soup
- Italian sausage — This is the backbone of the soup. It seasons the broth from the start, and the rendered fat gives the tomato base more depth than lean meat can. Mild or hot both work; hot sausage gives the bowl more edge without needing extra spice.
- Tomato paste — Don’t skip the minute in the hot pot with the onion and garlic. That short sauté cooks off the raw taste and turns the paste darker and sweeter, which makes the broth taste slow-cooked even though the pressure cook is fast.
- Crushed tomatoes plus diced tomatoes — The crushed tomatoes build body, while the diced tomatoes leave little bursts of texture. You can use all crushed tomatoes if that’s what you have, but the soup will be smoother and less chunky.
- Lasagna noodles — Break them into 2-inch pieces so they fit a spoon and cook evenly. Regular lasagna noodles work better than no-boil here because they hold their shape under pressure instead of turning soft too quickly.
- Ricotta, mozzarella, and parmesan — This cheese dollop is what makes the bowl taste like lasagna instead of tomato soup with pasta. Ricotta gives creaminess, mozzarella melts into the soup, and parmesan adds the salty finish. Stir them together just before serving so the texture stays fluffy instead of watery.
From Sauté to Pressure Cook Without Losing the Pasta
Brown the sausage first
Set the Instant Pot to sauté and cook the sausage until it’s deeply browned, not just no longer pink. That browning is where a lot of the flavor comes from. Drain off excess fat if there’s a puddle in the bottom, but leave a little behind so the onion has something to cook in. If the pot starts to scorch, lower the heat and scrape up the browned bits before they darken too much.
Build the tomato base
Add the onion and cook it until it turns translucent and soft at the edges, then stir in the garlic and tomato paste. The garlic only needs about a minute; any longer and it turns sharp instead of fragrant. The tomato paste should darken slightly and smell sweeter. That’s the point where the soup starts tasting like it simmered all day.
Pressure cook the soup body
Add the tomatoes, broth, seasonings, and broken noodles, then press the noodles under the liquid with a spoon. Lock the lid, cook on high for 4 minutes, and quick release as soon as the timer ends. If you wait, the noodles keep softening and the soup thickens too much. Stir gently after opening the lid so the noodles don’t break apart.
Finish with the cheese dollop
Stir the ricotta, mozzarella, parmesan, and basil together in a small bowl. Spoon a generous dollop into each serving bowl, then ladle the hot soup over or around it. The heat should soften the cheese into creamy pockets, not fully dissolve it. If the soup seems too thick, thin it with a splash of broth before serving; if it’s too loose, let it simmer on sauté for a few minutes until it tightens up.
Three Ways to Adapt This Bowl Without Losing What Makes It Good
Make it dairy-free
Skip the ricotta-mozzarella-parmesan dollop and finish each bowl with a drizzle of good olive oil and chopped basil instead. The soup itself stays satisfying because the sausage and tomato broth carry most of the weight. You lose the creamy lasagna finish, but you keep the savory, hearty base.
Use ground turkey instead of sausage
Ground turkey works, but it needs help. Add an extra pinch of Italian seasoning and a little more salt, and don’t skip the tomato paste step because that’s where you build depth back in. The soup will be lighter and less rich, but still full of flavor.
Gluten-free version
Use a sturdy gluten-free lasagna noodle and keep the cook time tight, because some gluten-free pasta softens faster under pressure. Check the texture right after quick release and stop there if it’s tender. The broth and cheese topping already do most of the heavy lifting, so the swap works well as long as you don’t overcook the pasta.
Add spinach at the end
A couple handfuls of baby spinach stirred in after pressure cooking will wilt in seconds and add a little freshness to the bowl. Add it after you open the lid so it doesn’t disappear into the soup or turn dull. It’s an easy way to add color without changing the flavor balance.
Storage and Reheating
- Refrigerator: Store in an airtight container for up to 4 days. The noodles will keep absorbing broth, so the soup gets thicker overnight.
- Freezer: It freezes, but the noodles soften after thawing. For the best texture, freeze the soup base without the pasta and cook fresh noodles when you reheat it.
- Reheating: Warm it gently on the stove or in the microwave with a splash of broth. The mistake people make is boiling it hard, which breaks the noodles down and makes the dairy topping separate if it’s already mixed in.
Questions I Get Asked About This Recipe
Instant Pot Lasagna Soup
Ingredients
Equipment
Method
- Set your Instant Pot to Sauté, then brown the Italian sausage and drain off the fat. Cook just until browned with visible crumbles.
- Add the diced onion to the pot and cook for 3 minutes, stirring occasionally until softened and slightly translucent. Visual cue: onion looks glossy and starts to brown lightly.
- Stir in the minced garlic and tomato paste and cook for 1 minute. Visual cue: tomato paste darkens slightly and smells fragrant.
- Add crushed tomatoes, diced tomatoes, chicken broth, Italian seasoning, dried basil, and red pepper flakes, then stir to combine. Visual cue: broth turns a deep, even red.
- Press the broken lasagna noodles under the liquid so they are submerged. Visual cue: noodles disappear beneath the surface.
- Seal the Instant Pot and pressure cook on High for 4 minutes. Visual cue: timer counts down and the pot comes to pressure.
- Quick release the pressure after cooking. Visual cue: steam vents and the float valve drops promptly.
- Stir the soup, then season with salt and pepper to taste. Visual cue: flavor looks balanced and the broth tastes complete.
- If the soup is too thick, add a splash of broth; if too thin, set to Sauté and simmer briefly until thickened. Visual cue: surface clings slightly to a spoon.
- Mix the cheese dollop ingredients by combining ricotta, mozzarella, parmesan, and basil. Visual cue: mixture becomes thick and scoopable.
- Serve in bowls with a generous dollop of the cheese mixture in the center. Visual cue: dollop softens and begins to melt as it meets the hot soup.
