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Slow Cooker Tomato Basil Baked Ziti Casserole

By PanPotPlates Test KitchenReviewed by PanPotPlates Editorial TeamPublished Apr 21, 2026 · Updated May 12, 2026
Italian-Inspired 195 mins slowcookeronepotfamilydinnereasycomfortfoodfreezablevegetarianmealprepbudget-friendly

This easy and comforting Slow Cooker Tomato Basil Baked Ziti Casserole features tender baked ziti pasta simmered in a rich tomato basil sauce, layered with creamy ricotta and melted mozzarella cheese. Ideal for hassle-free family dinners, meal prep, and freezer-friendly portions that keep well.

Slow Cooker Tomato Basil Baked Ziti Casserole
Prep 15 min
Cook 180 min
Total 195 min
Servings 6
Difficulty easy
Cuisine Italian-Inspired

Recipe Details

Prep15 min
Cook180 min
Total195 min
Servings6
Difficultyeasy
CuisineItalian-Inspired
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Ingredients

Servings 6
  • 1 pound dry ziti pasta
  • 4 cups marinara sauce (homemade or store-bought)
  • 1 ½ cups part-skim mozzarella cheese, shredded
  • ½ cup grated Parmesan cheese
  • 1 cup ricotta cheese
  • 1 medium onion, finely chopped
  • 3 cloves garlic, minced
  • 2 teaspoons dried basil or ¼ cup fresh basil, chopped
  • 1 teaspoon dried oregano
  • ½ teaspoon red pepper flakes (optional)
  • 1 ½ cups water or vegetable broth
  • Salt and freshly ground black pepper, to taste
  • 2 tablespoons olive oil

Instructions

  1. Heat olive oil in a medium skillet over medium heat. Add the finely chopped onion and sauté until softened and translucent, about 3-4 minutes.
  2. Add minced garlic, dried basil, oregano, and red pepper flakes if using. Cook, stirring frequently, until fragrant, about 1 minute.
  3. Pour marinara sauce into the skillet and stir to combine. Remove from heat.
  4. In the slow cooker pot, combine dry ziti pasta and water or vegetable broth.
  5. Pour the tomato basil sauce mixture over the pasta. Stir gently to coat the pasta evenly with the sauce.
  6. Add dollops of ricotta cheese evenly throughout the mixture. Fold gently to incorporate the ricotta, leaving creamy pockets visible for a rich texture.
  7. Sprinkle 1 cup of shredded mozzarella evenly over the top.
  8. Cover the slow cooker and cook on LOW for 2½ to 3 hours, until the pasta is tender and the sauce thickens.
  9. About 15 minutes before serving, sprinkle the remaining ½ cup mozzarella and Parmesan cheese over the casserole. Cover and continue cooking until the cheese is melted and bubbly.
  10. Once cooked, stir gently to combine the melted cheese throughout. Season with salt and freshly ground black pepper to taste.
  11. Garnish with fresh chopped basil if desired and serve hot.

Frequently Asked Questions

Reader questions and answers for this recipe will appear here.

Adapt the Slow Cooker Tomato Basil Baked Ziti Casserole to your dietary preferences or needs with these ingredient swaps:

  • Gluten-Free: Replace regular dry ziti with gluten-free pasta varieties (rice, corn, quinoa-based) that hold texture well in slow cooking.
  • Dairy-Free: Use plant-based cheeses like cashew-based ricotta and vegan shredded mozzarella to keep the dish dairyfree and vegan-friendly.
  • Vegan: Ensure marinara sauce is free of animal products, swap all cheeses for dairy-free alternatives, and use vegan vegetable broth. Omit Parmesan garnish.
  • Low Sodium: Choose low-sodium marinara and broth. Adjust salt carefully during seasoning to suit taste.
  • Protein Boost: Add cooked lentils or canned white beans to the sauce for extra vegetarian protein and heartiness.
  • Herb Variations: Fresh oregano or an Italian herb blend can substitute dried herbs for brightness and complexity.

These modifications keep the casserole easy, nutritious, family-friendly, and perfect for meal prep without sacrificing authentic Italian-inspired comfort flavors.

Pan Or Pot Required

This Slow Cooker Tomato Basil Baked Ziti Casserole is designed for simple, hands-off cooking using a slow cooker (crockpot). You'll need two main cookware items:

  • Medium Skillet or Sauté Pan: To gently sauté onions, garlic, and herbs, building the sauce’s flavor before slow cooking. Choose a pan with an easy-to-handle lid for better control.
  • Slow Cooker Pot: The primary vessel for this one-pot casserole. A 4–6 quart slow cooker insert is recommended to combine dry pasta, sauce, broth, and cheeses evenly, allowing slow simmering to create tender, infused baked ziti.

This method minimizes cleanup by limiting cooking vessels to just two. Sautéing on the stove unlocks richer flavor, while the slow cooker ensures moist, tender pasta with melty, bubbly cheese—perfect for slowcooker, onepot, and comfortfood fans seeking easy family dinners or freezer-ready meals.

Pro Tip: No slow cooker? A heavy Dutch oven or oven-safe pot can be used with adjusted oven cooking times, but the classic slow cooker pot remains easiest and most convenient for this casserole.

Cookware Size Guidance

For best results, use a slow cooker with a capacity of 5 to 6 quarts for the Slow Cooker Tomato Basil Baked Ziti Casserole. This size offers ample room to combine and cook the pasta, sauce, and cheeses evenly without overcrowding, ensuring tender, uniformly cooked pasta.

Using a smaller slow cooker may cause uneven cooking or overflow, while a significantly larger one can lead to thinner layers that affect texture and longer cook times. A 5 to 6 quart slow cooker is also perfect for making family-sized portions with leftovers.

If you don’t have a slow cooker of this size, halve the recipe or use a 9x13 inch oven-safe casserole dish as an alternative, adjusting cooking temperature and time.

Cookware Swap Guidance

This comforting casserole is crafted for the slow cooker to create tender baked ziti with minimal active prep. However, if you lack a slow cooker, you can use these alternatives without sacrificing ease or flavor:

  • Dutch Oven or Large Oven-Safe Pot: Simmer covered on low heat on the stovetop or bake covered at 350°F (175°C) for 45-60 minutes until pasta is tender and sauce thickens. Stir occasionally to prevent sticking.
  • Oven Casserole Dish: Layer ingredients in a 9x13 inch dish, cover with foil, and bake at 350°F (175°C) for 45-60 minutes. This method offers easy sheet-pan style convenience and melty cheese texture.
  • Slow Cooker Insert Alternatives: Use a multi-cooker pot with a slow cooker or low bake setting, such as the Instant Pot slow cooker function or electric Dutch oven slow cooking mode, for similar results.

These options keep the recipe easy, family-friendly, and ideal for meal prep while maintaining the comforting, budget-conscious, and cheesy Italian-inspired qualities.

Leftovers Quality

Leftovers from this Slow Cooker Tomato Basil Baked Ziti Casserole maintain excellent flavor and texture, making it ideal for meal prep and family-friendly freezer meals.

Refrigeration: Store cooled leftovers in airtight containers in the fridge for up to 3-4 days, preserving moisture and fresh taste.

Freezing: Portion casserole into meal-sized containers and freeze for up to 2 months, wrapped tightly to prevent freezer burn. Label with the date for best use.

Reheating: Warm refrigerated or thawed portions in a 350°F (175°C) oven, covered with foil, for 20-25 minutes until heated through. Alternatively, microwave single servings covered for 2-3 minutes, stirring halfway. Adding extra mozzarella or Parmesan cheese before reheating rejuvenates the creamy, cheesy texture.

These storage and reheating tips help you enjoy this easy, slowcooker, familydinner, and comfortfood classic multiple times with minimal effort.

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