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November 2, 2026

4-Ingredient Slow Cooker Casserole

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4-Ingredient Slow Cooker Casserole–an easy 4-ingredient slow cooker dinner made with Italian sausage, frozen ravioli, marinara sauce and melted mozzarella cheese. It’s a simple meal that tastes like lasagna without all the work!

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4-Ingredient Slow Cooker Casserole--an easy 4-ingredient slow cooker dinner made with Italian sausage, frozen ravioli, marinara sauce and melted mozzarella cheese. It's a simple meal that tastes like lasagna without all the work!

4-Ingredient Slow Cooker Casserole

If you love lasagna but don’t love all the work that goes into making it, this recipe is for you! With just 4 ingredients and about 10 minutes of prep time, you can have a delicious, cheesy Italian dinner cooking away in your slow cooker. I love using frozen ravioli because it takes the place of traditional lasagna noodles and adds an extra layer of cheesy goodness. Greg and I both loved how hearty and flavorful this turned out, especially with the Italian sausage and roasted garlic sauce!

Ingredients/Substitution Ideas

  • Italian sausage–use mild or hot Italian sausage depending on how much spice you like
  • Frozen ravioli–you can also use tortellini
  • Mezzetta roasted garlic sauce–or your favorite jarred marinara or pasta sauce
  • Shredded mozzarella–or an Italian cheese blend

Steps

Heat a pan over medium high heat. Add in the Italian sausage and break it up. Brown for about 5 minutes. Transfer half to the slow cooker.

Add in half of the ravioli and half of the sauce. Layer in the remaining sausage, ravioli and sauce.

Cover and cook on low for 2-3 hours. 

Sprinkle the mozzarella on top and let it melt.

Serve and enjoy!

4-Ingredient Slow Cooker Casserole--an easy 4-ingredient slow cooker dinner made with Italian sausage, frozen ravioli, marinara sauce and melted mozzarella cheese. It's a simple meal that tastes like lasagna without all the work!

Notes/Tips

  • Serve with a green salad or Caesar salad and garlic bread.
  • There’s no need to thaw the ravioli before adding it to the slow cooker. Just layer it in straight from the freezer.
  • If you want to add in veggies try adding in a handful of fresh spinach with the ravioli and sauce. You could also add sautΓ©ed mushrooms or zucchini.
  • Store leftovers in an airtight container* in the refrigerator for 4 days. Freeze leftovers for up to 3 months.
  • Other recipes you can make with mozzarella are Instant Pot Caprese Chicken and Attention Span Casserole.
  • Tools:
    • I used my 4 quart slow cooker* but next time I’d use a 6 quart slow cooker so there would be more room.
    • Wooden saute paddle*
    • Cheese grater*
Did you know you can filter the recipes on my website to search by meat type, IP or Crockpot, low carb, gluten free, etc.? Use the filter to find exactly what you are looking for. 

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4-Ingredient Slow Cooker Casserole--an easy 4-ingredient slow cooker dinner made with Italian sausage, frozen ravioli, marinara sauce and melted mozzarella cheese. It's a simple meal that tastes like lasagna without all the work!
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4-Ingredient Slow Cooker Casserole


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  • Author: 365 Days of Slow and Pressure Cooking
  • Prep Time: 15 minutes
  • Cook Time: 2-3 hours
  • Total Time: 0 hours
  • Yield: 6 servings 1x
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Description

An easy 4-ingredient slow cooker dinner made with Italian sausage, frozen ravioli, marinara sauce and melted mozzarella cheese. It’s a simple meal that tastes like lasagna without all the work!


Ingredients

Scale
  • 16 oz Italian sausage
  • 20 oz frozen ravioli
  • 1 (24 oz) jar Mezzetta roasted garlic sauce
  • 1/4 cup water
  • 1 cup shredded mozzarella

Instructions

  1. Heat a pan over medium high heat. Add in the Italian sausage and break it up. Brown for about 5 minutes. Transfer half to the slow cooker.
  2. Add in half of the ravioli and half of the sauce and half of the water. Layer in the remaining sausage, ravioli and sauce and water.
  3. Cover and cook on low for 2-3 hours. 
  4. Sprinkle the mozzarella on top and let it melt.
  5. Serve and enjoy!
  • Category: Pasta
  • Method: Slow Cooking
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Hi, I’m Karen. I know that dinner time can be less than relaxing. Busy schedules and cranky kids and a hundred other things can lead to weariness when it comes to putting dinner on the table. I can help! I make homemade, family-friendly slow cooker and Instant Pot dinners and share the recipes with you.

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