Broken lasagna noodles, rich tomato broth, and a spoonful of ricotta melting into the center is the kind of bowl that disappears fast. This Instant Pot version gives you the deep, slow-cooked comfort of lasagna without the layering, baking, or long simmering. The sausage builds the base, the tomatoes stay bright, and the noodles cook right in the broth so every bite tastes like it came together in one pot with a lot more effort than it actually took.
The trick here is balance. Tomato paste gets cooked with the onion and garlic first so it loses that raw edge and adds body, and the noodles go in after the broth so they soften without turning gummy. Broken lasagna sheets can cling together if they sit on top of the liquid, so press them down before sealing the pot. That small step keeps the texture right and helps the pressure cooker do its job evenly.
Below, I’ve included the timing that keeps the noodles tender instead of mushy, plus the cheese topping that turns a solid soup into the bowl people keep going back to for “just one more spoonful.”
The noodles stayed perfectly tender and the broth was thick enough to cling to the spoon without getting mushy. I added a little extra red pepper flakes and the ricotta topping melted into the soup just like a lasagna slice.
Save this Instant Pot Lasagna Soup for a fast, cozy bowl with sausage, broken noodles, and that melty ricotta topping.
The Step That Keeps the Noodles from Turning to Porridge
The biggest mistake in lasagna soup is letting the pasta sit too long under pressure. Lasagna noodles cook fast once they’re exposed to heat and liquid, and the Instant Pot keeps pushing them past the point of tender if you give them a full simmering-style cook time. Four minutes on High is enough because the broth is already hot by the time the pressure builds.
Breaking the noodles into 2-inch pieces helps them fit on a spoon, but it also helps them cook more evenly. If you leave big sheets in the pot, they can stick together or float above the liquid and stay undercooked in the middle. Pressing them down before sealing matters more than people think. If even a few pieces are dry on top, they’ll stay hard while the rest of the soup is finishing.
- Italian sausage — This brings the seasoned, savory backbone of the soup. Hot or mild both work, and if you use turkey sausage, brown it well so you still get some depth in the broth.
- Tomato paste — A minute in the hot pot changes everything here. It loses the raw tinny edge and gives the broth a richer, almost simmered flavor without extra cook time.
- Crushed tomatoes and diced tomatoes — The crushed tomatoes thicken the soup, while the diced tomatoes leave little bursts of texture. Using both keeps the broth from tasting flat.
- Lasagna noodles — Regular dried noodles are best. No-boil noodles can turn softer than you want under pressure, and standard noodles hold their shape better in soup.
- Ricotta, mozzarella, and parmesan — This topping matters. Ricotta gives that creamy lasagna feel, mozzarella adds stretch, and parmesan brings salt and bite. Stir them together right before serving so the topping stays fluffy instead of watery.
What Each Ingredient Is Actually Doing in This Recipe
- Primary ingredient (the star) — Quality matters most. Choose the best you can find.
- Cooking medium (oil, butter, or broth) — This carries flavors and prevents dryness.
- Seasonings (salt, pepper, spices, herbs) — Layer flavors so nothing overpowers. Build depth gradually.
- Aromatics (garlic, onion, herbs) — Cook with fat to bloom flavors. Become the foundation.
- Supporting ingredients — Complement the main ingredient without overpowering it.
- Sauce or liquid (if applicable) — Brings flavors together. Balance richness with acid.
- Acid (lemon, vinegar, wine, or other) — Brightens and prevents flat-tasting results.
- Final finish (garnish, glaze, or sauce) — Prevents one-dimensional taste and adds visual appeal.
Building the Base Before the Pressure Cook
Browning the Sausage
Cook the sausage until it’s deeply browned in spots, not just no longer pink. Those browned bits stuck to the bottom are part of the flavor, and they loosen once the tomatoes and broth go in. If the pan starts looking greasy, drain off the excess fat, but leave enough behind to cook the onion.
Softening the Onion and Garlic
Add the onion and cook it until it turns translucent and starts to smell sweet, about 3 minutes. Garlic goes in after that, not before, because it burns fast in the Sauté setting. The tomato paste joins the garlic for one minute, which gives you a deeper base and keeps the final broth from tasting sharp.
Pressure Cooking Without Overdoing It
Once the broth, tomatoes, and seasonings go in, stir well and press the noodles under the liquid. Lock the lid, set it to High Pressure for 4 minutes, and quick release as soon as the timer finishes. If you let it natural release too long, the noodles keep cooking and the soup thickens into a softer, heavier texture than lasagna soup should have.
Finishing the Bowl
Stir the soup after pressure cooking to separate any noodles that clung together, then taste for salt and pepper. If it’s thicker than you want, loosen it with a splash of broth. If it’s a little thin, set the pot back to Sauté for a minute or two and let it reduce gently. The cheese dollop should be added right on top of each bowl so it melts into the hot soup instead of disappearing into the pot.
How to Adapt This for Different Eaters and Different Nights
Make It Without Pork
Use turkey or chicken Italian sausage instead of pork sausage. You’ll lose a little richness, so brown it well and don’t skip the tomato paste step. That extra browning gives the lighter meat the backbone it needs.
Gluten-Free Version
Swap in a sturdy gluten-free pasta cut into short pieces, but watch it closely because it can go soft faster than wheat noodles. If your brand tends to overcook, use the Sauté function to finish the soup instead of pressure cooking the pasta, then add the noodles at the end and simmer just until tender.
Vegetarian Bowl
Skip the sausage and use chopped mushrooms or a plant-based Italian-style crumble for the base. Swap the chicken broth for vegetable broth and add a little extra parmesan if you want more savory depth. The result is lighter, but it still has that tomato-and-cheese comfort people want from lasagna soup.
Storage and Reheating
- Refrigerator: Keep leftovers in an airtight container for up to 4 days. The noodles will absorb broth as it sits, so expect a thicker soup the next day.
- Freezer: It freezes well, but the noodles soften after thawing. For best results, freeze the broth and sausage without the pasta, then cook fresh noodles when you reheat.
- Reheating: Warm it gently on the stove or in the microwave with a splash of broth to loosen it up. High heat can make the noodles break apart, so heat just until steaming and stir once or twice.
Answers to the Questions Worth Asking
Instant Pot Lasagna Soup
Ingredients
Equipment
Method
- Set Instant Pot to Sauté and brown the Italian sausage, breaking it up as it cooks, then drain excess fat.
- Add the diced onion and cook for 3 minutes until softened.
- Stir in the minced garlic and tomato paste, cooking for 1 minute until fragrant.
- Add crushed tomatoes, diced tomatoes, chicken broth, Italian seasoning, dried basil, and red pepper flakes, then stir to combine.
- Press the broken lasagna noodles down so they are mostly submerged under the liquid.
- Seal the lid and pressure cook on High for 4 minutes.
- Use a quick release, then open the Instant Pot.
- Stir and season with salt and pepper to taste.
- If the soup is too thick, add a splash of broth; if too thin, set to Sauté and simmer briefly until it reaches your preferred consistency.
- Mix the cheese dollop ingredients (ricotta, mozzarella, parmesan, and basil).
- Ladle soup into bowls and add a generous dollop of the cheese mixture so it melts into the center.
