Slow Cooker Ravioli Lasagna (Frozen Ravioli, No Boiling)

Slow cooker ravioli lasagna gives you all the layers of a baked lasagna with none of the noodle boiling or careful assembly. Frozen cheese ravioli stand in for the pasta and ricotta layers, a quick meat sauce goes between them, and mozzarella melts over the top.

The ravioli go in straight from the freezer, which is exactly what you want. They cook through in the sauce over a few hours and come out tender without turning to mush. The result cuts into wedges like a real lasagna once it rests.

This is a genuine dump and go dinner once the sausage is browned. Full amounts and both LOW and HIGH times are in the recipe card below.

Why this recipe works

• Frozen ravioli hold their shape. Starting frozen slows the cooking of the pasta so the filling stays put and the edges do not dissolve.
• Browning the sausage first matters. It brings the meat to a safe temperature, renders fat you can drain off and adds deep flavor the slow cooker cannot create on its own.
• A ricotta layer adds creaminess. Ravioli filling alone can be sparse, so a thin layer of seasoned ricotta makes every bite taste like lasagna.
• Sauce on the bottom prevents sticking. A layer of sauce under the first ravioli keeps the pasta from catching on the insert.
• A rest before cutting sets the layers. Fifteen minutes with the lid off firms everything enough to slice cleanly.

Ingredients you’ll need

The recipe card has the full list. These are the components that decide how the dish turns out.

Frozen cheese ravioli are the backbone. Look for standard 2 inch square or round ravioli, about 25 ounces per bag. Mini ravioli cook faster and can overcook, and jumbo ravioli take longer and leave gaps.

Italian sausage gives the sauce body and seasoning in one ingredient. Sweet or hot both work. Marinara and a can of diced tomatoes make enough sauce to cook the pasta and keep the dish moist.

Ricotta, one egg and Parmesan make a quick creamy layer. Shredded mozzarella goes between layers and on top. A handful of fresh basil at the end brightens everything.

Ingredient notes and smart substitutions

Frozen ravioli

Cheese ravioli are the classic choice, but spinach and ricotta or mushroom ravioli work one for one. Refrigerated fresh ravioli also work, though they cook faster, so reduce the LOW time by 30 to 45 minutes and check early. Do not use dried shelf stable ravioli, which need much more liquid.

Italian sausage

Ground beef swaps one for one and needs 1 teaspoon Italian seasoning and 1/2 teaspoon fennel seed added to make up the flavor. Ground turkey works the same way with an extra tablespoon of olive oil. Any ground meat must be cooked to 160°F before it goes in, and turkey to 165°F. For a vegetarian version, skip the meat and add 8 ounces of sauteed mushrooms and a second can of diced tomatoes.

Marinara

Two 24 ounce jars are the right amount. If you prefer homemade, use 6 cups of your own sauce. A 28 ounce can of crushed tomatoes plus 1 teaspoon each of dried basil and oregano and 1/2 teaspoon salt can replace one jar in a pinch.

Ricotta

Whole milk ricotta gives the creamiest result. Part skim works one for one but is a little grainier. Cottage cheese blended smooth is a common swap at the same amount. For extra richness, stir 2 ounces of softened cream cheese into the ricotta.

Mozzarella

Low moisture shredded mozzarella melts cleanly and is the right choice here. Fresh mozzarella releases too much water. A blend of mozzarella and provolone at the same total weight adds a sharper edge.

How to make it

1. Brown the sausage

Cook the sausage with the diced onion in a large skillet over medium high heat, breaking it into small pieces, until no pink remains and it reaches 160°F, about 8 minutes. Add the garlic for the last minute. Drain the fat, then stir in the marinara, drained diced tomatoes and Italian seasoning.

2. Mix the ricotta

In a bowl, stir the ricotta, egg, Parmesan, a pinch of salt and a few grinds of pepper until smooth. The egg helps the layer set so it slices rather than oozes.

3. Layer

Spread 1 1/2 cups of sauce in the bottom of a greased 6 quart slow cooker. Add a single layer of frozen ravioli, about one third of the bag total. Dollop half the ricotta over the ravioli and spread gently. Sprinkle with 1 cup mozzarella. Repeat with sauce, ravioli, the rest of the ricotta and another cup of mozzarella, then finish with the remaining ravioli and sauce.

4. Cook

Cover and cook on LOW for 3 to 4 hours or on HIGH for 2 to 2 1/2 hours. Do not lift the lid during cooking. The ravioli should be tender when pierced and the sauce should be bubbling around the edges.

5. Top and rest

Sprinkle the last cup of mozzarella over the top, cover and cook 10 more minutes until melted. Turn the cooker off, remove the lid and let the lasagna rest for 15 minutes. This rest is what lets you cut clean wedges.

Common mistakes and how to fix them

The ravioli turned mushy. They cooked too long or were thawed first. Keep them frozen and check at the early end of the time range. A 6 quart oval cooker also helps by spreading the layers so nothing sits too long in liquid.

The edges burned or stuck. The sauce layer on the bottom was too thin or the cooker runs hot. Use a full 1 1/2 cups of sauce on the bottom and grease the insert. If your cooker scorches often, line it with a slow cooker liner or a sheet of parchment.

The dish is watery. Diced tomatoes were not drained or fresh mozzarella was used. Drain the tomatoes well, stick with low moisture mozzarella and give the lasagna its full 15 minute rest.

The ricotta is grainy or separated. Part skim ricotta and long cook times do this. Use whole milk ricotta and mix in the egg, which binds the layer.

The top layer of ravioli is dry. Make sure the last ravioli layer is fully covered with sauce before the lid goes on. Any exposed pasta will toughen.

Timing and make ahead plan

Browning the sausage and layering takes about 20 minutes. The cook is unattended, and the rest adds 15 minutes at the end. On LOW, start it around 2 pm for a 6 pm dinner. On HIGH, start around 3 pm.

The meat sauce can be made up to 3 days ahead and refrigerated, or frozen for 3 months and thawed. The ricotta mixture also keeps for 2 days in the refrigerator. With both ready, assembly takes 5 minutes.

You can layer the whole dish in the insert the night before if your insert is removable. Keep it covered in the refrigerator, then set it in the base and start cooking. Add 20 to 30 minutes since the insert starts cold. The ravioli will partly thaw overnight, so check them early.

Do not assemble and freeze the whole lasagna in the insert. A frozen block heats too slowly in a slow cooker to be safe.

Tips for the best ravioli lasagna

• Use an oval slow cooker if you have one. The wider footprint means thinner layers and more even cooking.
• Do not pack the ravioli tightly. Slight gaps let the sauce move between layers and cook the pasta evenly.
• Grease the insert with olive oil or cooking spray before the first sauce layer.
• Cook on LOW when you can. The gentler heat gives the ravioli time to soften without breaking apart at the edges.
• Let it rest. Cutting straight from the cooker gives you a delicious pile rather than a slice.

If you want a browned, bubbly top like an oven lasagna, transfer the insert to the oven only if the manufacturer says it is oven safe. Otherwise, scoop portions into an ovenproof dish, top with cheese and broil for 2 to 3 minutes.

Variations

Spinach ravioli lasagna

Stir 1 cup of thawed, well squeezed frozen spinach into the ricotta mixture. It adds color and works especially well with spinach and cheese ravioli.

Chicken Alfredo ravioli lasagna

Replace the sausage and marinara with 3 cups of shredded cooked chicken and two 15 ounce jars of Alfredo sauce plus 1 cup of chicken broth. Layer the same way and cook on LOW only, 3 to 3 1/2 hours, since cream sauces scorch faster.

Three cheese vegetarian version

Skip the sausage and use two 24 ounce jars of marinara plus one 28 ounce can of crushed tomatoes. Add a layer of sauteed zucchini and mushrooms between the ravioli for substance.

Spicy sausage and pepper version

Use hot Italian sausage and add 1 diced red bell pepper to the skillet with the onion. Finish with a pinch of red pepper flakes over the top layer of cheese.

Equipment that makes this easier

A 6 quart slow cooker is the right size for two bags of ravioli in three layers. An oval model is ideal. A 5 quart round cooker works but the layers will be thicker, so add 20 to 30 minutes and check the center ravioli for tenderness.

A large skillet browns the sausage quickly. A 12 inch pan gives the meat room to sear instead of steam.

Slow cooker liners or parchment make cleanup trivial and prevent sticking. A flexible silicone spatula helps spread the ricotta without dragging the ravioli around.

Scaling up or down

This recipe fills a 6 quart cooker, so doubling requires two cookers. If you have an 8 quart oval model, use 3 bags of ravioli, 3 jars of sauce and 1 1/2 pounds of sausage and add 45 minutes to the LOW time.

To halve the recipe, use a 3 to 4 quart cooker with one bag of ravioli, one jar of sauce, 1/2 pound of sausage, 8 ounces of ricotta with a small egg and 1 1/2 cups of mozzarella. Cook time stays about the same, checking at the early end.

Keep the layer order and the sauce on the bottom no matter the size. The proportions matter less than making sure every ravioli is covered with sauce.

When cooking for a large group, it is easier to run two 6 quart cookers side by side than to stack one very deep. Deep layers cook unevenly, and the bottom ravioli end up soft long before the middle ones are done.

A halved batch also makes a good weeknight dinner for two with leftovers. Refrigerated slices reheat well for lunches later in the week.

What to serve with it

A crisp Caesar salad and garlic bread are all this needs. Roasted broccoli or green beans add color and cut through the cheese. When you want a more traditional oven version for a special dinner, classic meat lasagna is worth the extra effort.

For other easy Italian style pasta bakes, try baked ziti or stuffed shells with spinach and ricotta. A pot of slow cooker meatballs on the side turns this into a party spread.

How to store, freeze and reheat

Refrigerator

Cool within 2 hours and refrigerate in an airtight container for up to 4 days. The lasagna firms as it chills and slices more neatly the next day.

Freezer

Cooked ravioli lasagna freezes well for up to 3 months. Cut it into portions, wrap each tightly in plastic and foil, and thaw overnight in the refrigerator. The pasta softens a little after freezing but the flavor holds.

Reheating

Reheat portions covered in a 350°F oven for 20 to 25 minutes until they reach 165°F in the center. In the microwave, cover and heat in 90 second bursts. A spoonful of extra marinara on top before reheating keeps the edges from drying out.

Leftover ideas

Chop leftover lasagna into chunks and pan fry in a little olive oil until the edges crisp. The browned bits of cheese and pasta make a surprisingly good weekend breakfast with a fried egg.

Layer cold slices into a baking dish with more sauce and a fresh layer of cheese, then bake at 375°F for 25 minutes for a second night that tastes new.

Cut ravioli lasagna into cubes and add them to a pot of simmering broth with spinach for a quick soup. If you are planning a batch cooking weekend, the fall freezer meal prep plan shows how to fit this dish into a week of easy dinners.

Nutrition notes

One serving, based on 8 servings, lands roughly in the range of 520 to 600 calories with about 28 grams of protein, 42 to 48 grams of carbohydrate and 26 to 32 grams of fat. Cheese ravioli and mozzarella account for most of the fat and sodium.

These are estimates and vary with the brand of ravioli, the sausage and the sauce. Using turkey sausage and part skim cheeses trims the fat and calories, and a vegetarian version with mushrooms comes in lower still.

Frequently asked questions

Do you have to thaw frozen ravioli before putting them in the slow cooker?

No, and you should not. Frozen ravioli cook more slowly in the sauce, which keeps them intact. Thawed or fresh ravioli overcook, so if you use them, cut the LOW time by 30 to 45 minutes.

How long does ravioli lasagna take in the slow cooker?

About 3 to 4 hours on LOW or 2 to 2 1/2 hours on HIGH, plus 10 minutes to melt the top cheese and 15 minutes to rest. Check at the early end since slow cookers vary.

Why is my slow cooker lasagna watery?

The most common causes are undrained canned tomatoes, fresh mozzarella and skipping the rest. Drain the tomatoes well, use low moisture shredded mozzarella and let the lasagna rest 15 minutes uncovered before cutting.

Can I make ravioli lasagna ahead of time?

Yes. Make the sauce up to 3 days ahead, or layer everything in a removable insert the night before and refrigerate. Add 20 to 30 minutes to the cook time when starting from a cold insert.

Can I use ground beef instead of sausage?

Yes. Brown 1 pound of ground beef to 160°F with the onion and add 1 teaspoon Italian seasoning and 1/2 teaspoon fennel seed to bring the flavor closer to sausage.