Instant Pot lasagna soup brings all the best parts of baked lasagna into one bowl: rich tomato broth, tender noodles, savory sausage, and that creamy cheese topping that melts into the center. It tastes like it simmered all afternoon, but the pressure cooker does the heavy lifting in a fraction of the time. The result is hearty without feeling heavy, and it lands right in that sweet spot where dinner feels comforting but still practical.
What makes this version work is the layering. Browning the sausage first builds the base flavor, and a quick cook on the onions and tomato paste takes the edge off the tomatoes before the broth goes in. The noodles cook directly in the soup, which means they pick up flavor instead of turning into bland pasta sitting in sauce. I also keep the cheese topping separate until serving so it stays creamy instead of disappearing into the pot.
Below, I’ll walk you through the exact timing that keeps the noodles from going mushy, plus the little adjustments that help if your soup comes out too thick or too brothy.
The noodles cooked up tender but not mushy, and the ricotta topping made it taste like real lasagna in a bowl. I had it on the table in under 30 minutes and my husband asked if there was enough for lunch tomorrow.
Save this Instant Pot lasagna soup for the nights when you want sausage, noodles, and melty ricotta in one fast bowl.
The Broth Needs a Head Start Before the Noodles Go In
The biggest mistake with soup versions of lasagna is treating the noodles like they can fix a thin broth later. They can’t. Once those broken noodles go into the pot, they start releasing starch fast, which is great for body but unforgiving if the liquid level is wrong or the tomato base hasn’t been seasoned yet. Build the broth first so it already tastes like dinner before the pasta enters the picture.
That also means the sausage, onion, garlic, and tomato paste need enough time to cook together before pressure cooking. The sausage fat carries flavor, the onion softens the sharp edges, and the tomato paste darkens a shade so the finished soup tastes deeper and less canned. If the base tastes flat before you seal the lid, pressure cooking won’t magically fix it.
What Each Ingredient Is Actually Doing in This Soup
- Italian sausage — This is the main source of savory depth. Mild sausage keeps the soup classic, while hot sausage adds a little heat without needing extra red pepper flakes. If you use turkey sausage, expect a lighter broth and add a touch more salt at the end.
- Tomato paste — This is not just there for color. Cooking it for a minute with the onion and garlic removes the raw, tinny edge and gives the broth a concentrated, almost simmered-all-day taste. Skip that step and the soup tastes thinner.
- Crushed tomatoes and diced tomatoes — The crushed tomatoes make the broth smooth and full-bodied, while the diced tomatoes leave little pockets of texture. If you only have one type, use it; the soup still works, but the texture changes.
- Lasagna noodles — Broken noodles are the whole point here. Cut them into rough 2-inch pieces so they fit on the spoon and cook evenly under pressure. Long shards can clump if they’re too large, so don’t break them into tiny bits.
- Ricotta, mozzarella, and parmesan — The cheese dollop gives you that lasagna finish without melting the whole pot into heaviness. Ricotta keeps it creamy, mozzarella adds stretch, and parmesan sharpens the flavor. Stir in fresh basil at the end so it stays bright.
Pressure Cooking the Soup Without Turning the Noodles to Mush
Brown the Sausage First
Set the Instant Pot to Sauté and let the sausage cook until it’s deeply browned and no longer pink. Drain off excess fat if there’s a lot, but leave a little behind because it carries flavor into the onion and garlic. If you rush this stage and only gray the meat, the soup tastes flatter and less layered.
Wake Up the Tomato Base
Add the onion and cook it until it softens, then stir in the garlic and tomato paste for about a minute. You want the paste to darken slightly and smell sweet, not raw. If the garlic starts to brown hard, the pot is too hot, so lower the heat before it turns bitter.
Seal, Pressure Cook, and Release Fast
Add the tomatoes, broth, seasonings, and noodles, then press the noodles under the liquid so they’re covered as much as possible. Lock the lid and cook on High Pressure for 4 minutes, then do a quick release. The short cook time is what keeps the noodles tender instead of bloated; if you leave them under pressure too long, they lose their bite fast.
Finish With the Cheese at the Table
Stir the soup and check the texture. If it looks too thick, add a splash of broth; if it seems loose, switch back to Sauté for a brief simmer. Mix the ricotta, mozzarella, parmesan, and basil separately, then spoon a generous dollop into each bowl so it melts into the hot soup without disappearing.
How to Adapt This for Different Pans, Diets, and Leftovers
Make It Lighter With Turkey Sausage
Turkey sausage works well here, but the broth loses some richness. Add a little extra olive oil when you sauté the onion and don’t skip the parmesan in the cheese topping, since it helps replace the savory depth you’d otherwise get from pork.
Gluten-Free Version
Use gluten-free lasagna noodles, but watch them closely because they can soften faster than wheat noodles. Keep the pressure time the same, then check texture immediately after release. If they need a little more time, simmer gently for a minute or two instead of pressure cooking again.
Dairy-Free Topping That Still Feels Creamy
Skip the ricotta and use a dairy-free cashew-based spread or plain unsweetened dairy-free cream cheese mixed with basil and a little nutritional yeast. It won’t melt quite like ricotta, but it still gives the soup that creamy finish on top.
Storage and Reheating
- Refrigerator: Store for up to 4 days. The noodles keep soaking up broth, so expect the soup to thicken.
- Freezer: Freeze the soup without the cheese topping for up to 2 months. The noodles soften a bit after thawing, but it still reheats well if you add fresh broth.
- Reheating: Warm it gently on the stove or in the microwave with a splash of broth. If you reheat it hard and fast, the noodles can break apart and the broth can turn overly thick before the center is hot.
Answers to the Questions Worth Asking
Instant Pot Lasagna Soup
Ingredients
Equipment
Method
- Set 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 and lightly browned.
- Add the minced garlic and tomato paste, then cook 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 under the liquid so they stay submerged.
- Seal the lid and pressure cook on High for 4 minutes, then do a quick release.
- Stir the soup well and season with salt and black pepper to taste.
- If the soup is too thick, add a splash of chicken broth; if it is too thin, set to Sauté and simmer briefly until thickened.
- Mix the ricotta, mozzarella, parmesan, and basil (for the cheese dollop) until combined.
- Ladle the soup into bowls and serve with a generous dollop of the cheese mixture melting into the center.
