There’s something deeply comforting about a bubbling casserole brimming with saucy pasta and melty cheese. This Instant Pot Baked Ziti brings that oven-baked vibe in a fraction of the time, with rich tomato flavor, hearty protein, and gooey mozzarella. It’s the kind of weeknight meal that doubles as a crowd-pleaser for potlucks, game nights, or laid-back dinner parties. Read on for tips, notes, and a clear, step-by-step method that guarantees tender ziti and an evenly sauced bite every time.

Why you’ll love this version

This Instant Pot Baked Ziti keeps things simple without skimping on flavor. Using an electric pressure cooker cuts down on cook time while keeping the pasta perfectly al dente. A combination of crushed and diced tomatoes builds texture, while tomato paste deepens the savory base. Ground Italian-style sausage adds a spiced meatiness; use mild or spicy according to your preference. A final cheese layer with ricotta and shredded mozzarella delivers that creamy, comforting finish.

Ingredients

1 tablespoon olive oil
1 lb mild or spicy Italian sausage, casings removed
1 medium onion, chopped
2 cloves garlic, minced
1 teaspoon dried Italian seasoning
1 teaspoon dried oregano
½ teaspoon kosher salt
¼ teaspoon black pepper
24 oz. crushed tomatoes
15 oz can diced tomatoes with juices
2 tablespoons tomato paste
1 lb ziti pasta
2 cups water
2 cups shredded mozzarella cheese
¾ cup ricotta cheese

Notes on ingredients and swaps

If you prefer a milder profile, choose mild Italian sausage; pick spicy for a kick. Keep the same quantity either way.
Use good-quality crushed tomatoes and diced tomatoes for the best texture—no need to drain the diced tomatoes since their juices help the cooking liquid.
Room-temperature ricotta blends more smoothly into the final bake; if it’s chilled, stir it briefly before using.
Ziti can be substituted with another tubular pasta like penne or rigatoni if needed, keeping the 1 lb amount the same.

Tools you’ll need

6- or 8-quart electric pressure cooker (Instant Pot or similar)
Wooden spoon or silicone spatula
Measuring cups and spoons
Cheese grater (if shredding mozzarella fresh)

Step-by-step directions

Prepare the Instant Pot. Plug in the pressure cooker and set it to the sauté function on normal or medium heat.
Sauté the aromatics and brown the sausage. Add 1 tablespoon olive oil to the pot. When the oil shimmers, add 1 lb mild or spicy Italian sausage (casings removed) and break it up with a spoon. Cook, stirring occasionally, until the sausage is browned but not fully crisp—about 4–6 minutes. Push the sausage to one side and add the chopped 1 medium onion. Sauté the onion with the sausage for 2–3 minutes until it begins to soften. Add 2 cloves garlic, minced, and cook for 30–45 seconds until fragrant.
Season the mixture. Sprinkle 1 teaspoon dried Italian seasoning, 1 teaspoon dried oregano, ½ teaspoon kosher salt, and ¼ teaspoon black pepper over the meat and onion. Stir to combine and let the spices bloom for about 30 seconds.
Add the tomato elements. Pour in 24 oz. crushed tomatoes, the full 15 oz can diced tomatoes with juices, and 2 tablespoons tomato paste. Stir thoroughly to combine the tomato paste so it dissolves into the sauce and nothing is stuck to the bottom of the pot.
Layer the pasta. Break up 1 lb ziti pasta into shorter pieces if necessary so it fits under the sauce and lays more evenly. Sprinkle the ziti over the tomato-and-sausage mixture, trying to distribute it as evenly as possible in a single layer. Do not stir the pasta into the sauce; simply press it down gently so it’s mostly submerged.
Add water. Pour 2 cups water evenly over the pasta, allowing the liquid to trickle between the pasta pieces. Press the pasta gently so it sits submerged, but avoid stirring the layers together.
Pressure cook. Secure the lid and ensure the valve is set to sealing. Set the pressure cooker to Manual/Pressure Cook on high for 6 minutes. It will take some time to come up to pressure.
Quick release and check. When the cook time ends, perform a quick pressure release by carefully moving the valve to venting. Once the pin drops and the lid opens, uncover the pot and give the pasta a gentle stir to combine the sauce and noodles. If you see excess liquid, stir to incorporate it; the sauce will continue to thicken as it rests.
Add cheeses. Dollop ¾ cup ricotta cheese over the hot pasta and spoon it gently to distribute pockets of creaminess. Sprinkle 2 cups shredded mozzarella cheese evenly across the top.
Melt the cheese. Switch the pressure cooker back to sauté on low, or use the “Keep Warm” function with the lid off, and cover the pot loosely with a lid or foil for 3–5 minutes to allow the mozzarella to melt. Alternatively, transfer the pot insert to a preheated broiler and broil 2–3 minutes to brown the cheese—watch closely to prevent burning.
Rest, serve, and garnish. Let the baked ziti rest for 5 minutes to set. Serve in bowls straight from the pot or transfer to a serving dish. Spoon extra ricotta or sprinkle additional shredded mozzarella if desired. A grind of black pepper or a pinch more dried oregano adds a nice finishing touch.

Troubleshooting & tips

If the sauce seems very thin after pressure cooking, stir and let it sit for several minutes—carryover heat thickens it. If needed, switch to sauté and simmer briefly until desired consistency is reached.
To avoid a burnt-bottom warning, be sure to fully deglaze the pot after browning the sausage. Scrape up any browned bits and mix them into the sauce before adding pasta and water.
For a lighter finish, use part-skim mozzarella; for extra richness, use whole-milk ricotta and a blend of mozzarella and provolone.
Leftovers store well: refrigerate in an airtight container for up to 4 days and reheat in the microwave or oven. Add a splash of water before reheating to revive the sauce if it has thickened.

Serving suggestions

Pair this Instant Pot Baked Ziti with a crisp green salad and a lemony vinaigrette to cut through the richness. Garlic bread, roasted vegetables, or steamed broccoli also make excellent sides. For a casual gathering, set out grated Parmesan and red pepper flakes so guests can customize each plate.

Nutrition snapshot (per serving, approximate)

Estimating six generous servings, each portion contains a hearty balance of protein, carbohydrates, and fat from the sausage, cheese, and pasta. Exact values depend on your specific brands and any swaps you make.

Final thoughts

This Instant Pot Baked Ziti is a fast, fuss-free way to enjoy a classic, comfort-food staple without spending hours in the kitchen. The pressure cooker locks in flavor and tenderness while keeping the steps straightforward. Whether you’re feeding a family or meal-prepping for the week, this saucy, cheesy dish hits all the right notes every time.