Instant Pot lasagna soup brings all the comfort of a baked pasta dinner into one pot, with a tomato broth that tastes like it simmered all afternoon and noodles that stay pleasantly tender instead of turning mushy. The sausage gives it backbone, the tomatoes stay bright, and the cheese dollop melts into the broth just enough to make every spoonful taste rich and cozy without feeling heavy.
What makes this version work is the layering. Browning the sausage first gives the soup depth before any liquid goes in, and tomato paste cooked with the onion and garlic adds a dark, savory base that canned tomatoes alone can’t provide. The noodles go in under the broth so they cook evenly under pressure instead of clumping on top. That small detail makes the difference between a soup that feels balanced and one that turns starchy fast.
You’ll also find the trick for adjusting the texture at the end, because lasagna soup should be brothy enough to eat with a spoon but thick enough to cling to the cheese. The ricotta-mozzarella topping is worth doing every time; it gives the bowl that classic lasagna finish without needing an oven.
The noodles held up perfectly and the broth was thick enough to feel like lasagna, not just tomato soup. I added the cheese dollop at the table and it melted into the bowl just like the photo.
Save this Instant Pot Lasagna Soup for a fast bowl of cheesy, tomato-rich comfort with broken noodles and sausage.
The Small Step That Keeps the Noodles from Turning to Mush
The biggest mistake with lasagna soup is treating the noodles like they can sit in the pot as long as the rest of the ingredients. They can’t. Broken lasagna noodles cook fast under pressure, and if you overdo them, they lose their shape and thicken the broth into glue. Four minutes on High is enough when the noodles are pressed under the liquid and the pressure release is quick.
The other thing that matters is the order of the base. Tomato paste needs a minute on the heat with the onion and garlic so it stops tasting raw and starts tasting deep and savory. If you skip that step, the soup can taste flat even after the cheese goes on top.
- Quick release: Stops the noodles from carrying on in the hot broth after cooking, which keeps the texture closer to lasagna and less like overcooked pasta.
- Broken noodle pieces: Two-inch pieces are the sweet spot. Smaller shards disappear, and longer pieces are awkward to eat with a spoon.
- Pressing noodles under the liquid: Dry corners on top won’t cook evenly and can stay hard when the rest of the pot is done.
What the Sausage, Tomatoes, and Cheese Are Each Doing Here
- Italian sausage: This is the backbone of the soup. Mild sausage gives you richness without extra heat, while hot sausage brings more bite. If you use ground turkey or chicken, add a little more Italian seasoning and a pinch of salt because those leaner meats need help.
- Crushed tomatoes plus diced tomatoes: Crushed tomatoes build the body of the broth, and diced tomatoes leave a few bright, chunky bites behind. Using both gives the soup the right balance of smooth and rustic. If all you have is one or the other, it still works, but the texture shifts noticeably.
- Tomato paste: This is the ingredient that makes the broth taste cooked instead of canned. Let it darken slightly in the pot before the liquids go in. That short step pays off in a deeper, less acidic finish.
- Ricotta, mozzarella, and parmesan: The topping matters here. Ricotta keeps the spoonful creamy, mozzarella melts into strings, and parmesan sharpens the whole bowl. A little basil in the mix keeps it from tasting heavy.
How to Build the Soup in the Right Order
Brown the Sausage First
Set the Instant Pot to Sauté and cook the sausage until it’s browned and no longer pink, then drain off the excess fat if there’s a lot in the pot. That first browning step gives you the savory base the broth can’t build on its own. If the sausage steams instead of browns, wait for more of the moisture to cook off before stirring it around again.
Cook the Onion, Garlic, and Tomato Paste
Add the diced onion and let it soften for about 3 minutes, then stir in the garlic and tomato paste for 1 minute. You’re looking for the paste to darken a shade and smell sweet, not raw. If the garlic starts to brown hard, the heat is too high, and the soup can pick up a bitter edge.
Pressure Cook the Broth and Noodles
Pour in the crushed tomatoes, diced tomatoes, broth, seasoning, basil, and red pepper flakes, then press the broken noodles under the liquid. Seal the pot and cook on High for 4 minutes, then quick release the pressure right away. If you let it natural release, the noodles keep cooking and the texture goes soft too fast.
Finish the Bowl
Stir the soup, then taste and season with salt and pepper. If it looks too thick, add a splash of broth; if it’s thinner than you like, use Sauté for a minute or two to tighten it up. Serve with a generous spoonful of the cheese mixture right in the center so it melts into the hot broth instead of disappearing into the pot.
How to Adapt It When You Need a Different Bowl
Make It Lighter with Turkey Sausage
Turkey sausage works well here, especially if you want a less rich broth. It won’t give quite the same depth as pork sausage, so add a little extra salt and keep the tomato paste step in place to build flavor back in.
Gluten-Free Lasagna Soup
Use your favorite gluten-free lasagna noodles, but check them early because some brands soften faster than wheat pasta. If they tend to break down, reduce the pressure cook time by a minute and let the soup sit a few minutes before serving so the noodles finish in the hot broth.
Dairy-Free Finish
Skip the ricotta-mozzarella topping and finish each bowl with a drizzle of olive oil and chopped basil instead. You lose the creamy lasagna-style finish, but the soup stays bright and satisfying, especially with a little extra parmesan-style dairy-free topping if you use one.
Storage and Reheating
- Refrigerator: Store for up to 4 days. The noodles absorb broth as it sits, so the soup thickens overnight.
- Freezer: Freeze the soup without the cheese topping for up to 3 months. The noodles will soften more after thawing, but the flavor holds up well.
- Reheating: Reheat gently on the stove or in the microwave with a splash of broth. The common mistake is blasting it until it boils hard, which breaks the noodles down even more.
Answers to the Questions Worth Asking
Instant Pot Lasagna Soup
Ingredients
Equipment
Method
- Set the Instant Pot to Sauté and brown the Italian sausage, then drain excess fat.
- Add the diced onion and cook for 3 minutes, stirring until softened.
- Add the minced garlic and tomato paste and cook for 1 minute, stirring to coat the onion mixture.
- Add the crushed tomatoes, diced tomatoes, chicken broth, Italian seasoning, dried basil, and red pepper flakes, then stir to combine.
- Press the broken lasagna noodles under the liquid so they are fully submerged.
- Seal the lid and pressure cook on High for 4 minutes, then quick release.
- Stir the soup and season with salt and pepper.
- If too thick, add a splash of broth; if too thin, set to Sauté and simmer briefly until thickened.
- Mix the cheese dollop ingredients (ricotta, mozzarella, parmesan, and basil).
- Serve each bowl with a generous dollop of the cheese mixture that melts into the center, topped with additional basil if desired.
