Rich tomato broth, tender noodles, and sausage make this Instant Pot lasagna soup taste like a full pan of baked pasta without the hour in the oven. The broth turns deep and savory, the broken noodles cook right in the pot, and the cheese dollop melts into the center of each bowl for that familiar lasagna finish. It lands between cozy and hearty in the best way.
What makes this version work is the layering. Browning the sausage first gives the soup a strong base, and a minute with the tomato paste wakes up the tomato flavor before any liquid goes in. The broken lasagna noodles cook under pressure in the broth, so they soften fast without turning to mush, as long as you keep the cook time short and release the pressure right away.
Below, I’ll walk through the part that keeps the noodles intact, the cheese topping that makes this taste like lasagna instead of just tomato soup, and the small adjustments that help if your broth ends up thicker or thinner than you wanted.
The noodles were perfectly tender and didn’t turn to mush, and the ricotta-mozzarella topping melted into the soup exactly like lasagna. My husband asked if I could put this on the regular dinner rotation.
Save this Instant Pot Lasagna Soup for a fast bowl of tender noodles, rich tomato broth, and that creamy ricotta-mozzarella finish.
The Noodle Timing That Keeps This Soup from Turning Starchy
The biggest mistake with lasagna soup is letting the noodles sit in the hot broth too long. Broken lasagna sheets release starch fast, and in a pressure cooker that can turn the soup thicker and gluey if you overcook it even a little. Four minutes on High is enough because the noodles are small, the liquid is hot, and the quick release stops the cooking before they lose their texture.
Brown the sausage first and you’ll get another layer of flavor before the soup even starts. That step also keeps the finished broth from tasting flat, which can happen when everything goes straight into the pot raw. If the soup thickens as it rests, that’s normal. Lasagna noodles keep drinking broth after the pressure cooking ends, so a splash of hot broth at the end fixes it fast.
What Each Ingredient Is Actually Doing in This Pot
- Italian sausage — This is the main source of seasoning and richness. Hot or mild both work, but sausage with good fat content gives the broth more body than lean ground meat. If you want a lighter version, use turkey Italian sausage, but add a little olive oil because it won’t render as much fat.
- Tomato paste — One minute with the onions and sausage changes everything here. It loses that raw canned taste and turns the tomato flavor deeper and sweeter. Don’t add it with the broth right away or it stays flat.
- Crushed and diced tomatoes — The crushed tomatoes build the body of the soup, while the diced tomatoes leave little bites of tomato in the bowl. If you only have crushed tomatoes, use them for both cans and the soup will be smoother.
- Lasagna noodles — Broken into 2-inch pieces, they cook like pasta but still give you that lasagna feel. Regular lasagna noodles are best because they hold up under pressure better than thin pasta. Break them roughly the same size so they cook evenly.
- Ricotta, mozzarella, and parmesan — This cheese dollop is what makes the soup taste like lasagna instead of tomato sausage soup. Ricotta gives creaminess, mozzarella melts into strings, and parmesan adds the salty edge. Stir in fresh basil right before serving for the cleanest flavor.
Building the Broth and Adding the Noodles at the Right Moment
Brown the sausage first
Set the Instant Pot to Sauté and cook the sausage until it has good color on the edges, not just until it turns gray. That browning gives you the savory base that carries the whole soup. Drain off excess fat if there’s a lot, but leave a little behind for the onions and tomato paste to cook in.
Wake up the tomato paste
Add the onion and cook it for a few minutes until it softens, then stir in the garlic and tomato paste. The paste should darken slightly and smell sweet, not sharp. If the garlic starts to brown hard, it’s gone too far, so keep that part short and keep stirring.
Pressure cook with the noodles under the liquid
Pour in the tomatoes, broth, and seasonings, then press the broken noodles down until they’re submerged. Anything sticking out of the liquid tends to cook unevenly and turn chewy. Seal the lid, cook on High for 4 minutes, and quick release right away so the noodles stop at tender instead of bloated.
Finish with the cheese bowl
Stir the soup and taste it before adding salt, since sausage and parmesan already bring salt to the party. If it looks too thick, loosen it with a splash of broth. If it looks thin, use Sauté for a couple of minutes. Ladle it into bowls and add the cheese dollop on top so it melts into the hot broth instead of disappearing into the pot.
Three Ways to Make This Work for Your Kitchen
Dairy-Free Version
Skip the ricotta and mozzarella topping and finish each bowl with a spoonful of dairy-free pesto or a little olive oil and chopped basil. You’ll lose the creamy lasagna-style melt, but the broth still tastes full and savory.
Gluten-Free Swap
Use gluten-free lasagna noodles or a sturdy gluten-free pasta shape and reduce the pressure-cook time by a minute if the package cooks quickly. Gluten-free pasta softens faster and can break down if you leave it under pressure too long.
Make It Spicier
Use hot Italian sausage and add the full amount of red pepper flakes, then finish each bowl with a pinch more on top. The heat shows up most clearly against the ricotta, so the soup tastes balanced instead of harsh.
Make-Ahead for Lunches
If you want leftovers that hold their texture, cook the soup base without the noodles and add freshly cooked noodles when serving. That keeps the broth from turning overly thick and keeps the pasta from soaking up everything overnight.
Storage and Reheating
- Refrigerator: Store for up to 4 days. The noodles will keep soaking up broth, so expect a thicker soup on day two.
- Freezer: It freezes best without the noodles. Freeze the broth and sausage mixture, then add freshly cooked noodles after thawing.
- Reheating: Warm it gently on the stove or in the microwave with a splash of broth or water. Don’t boil it hard, or the noodles can break apart and the dairy topping can separate.
Questions I Get Asked About This Recipe
Instant Pot Lasagna Soup
Ingredients
Equipment
Method
- Set Instant Pot to Sauté and brown the Italian sausage, then drain excess fat (look for browned crumbles).
- Add the diced onion and cook for 3 minutes (stir until softened and slightly translucent).
- Add the minced garlic and tomato paste and cook for 1 minute (stir until fragrant and deeper red).
- Add crushed tomatoes, diced tomatoes, chicken broth, Italian seasoning, dried basil, and red pepper flakes, then stir to combine (sauce should look uniform).
- Press the broken lasagna noodles under the liquid so they’re submerged (you should see noodles disappear under the surface).
- Seal and pressure cook on High for 4 minutes, then do a quick release (watch for a quick drop in pressure).
- Stir the soup and season with salt and pepper to taste (taste and adjust until balanced).
- If it’s too thick, add a splash of broth; if it’s too thin, set to Sauté and simmer briefly (look for the soup to coat a spoon).
- Mix the cheese dollop ingredients by combining ricotta, mozzarella, parmesan, and basil (the mixture should hold together in a thick dollop).
- Serve in bowls with a generous cheese dollop in the center (the cheese should start melting on contact).
