Introduction
Imagine coming home to the rich, comforting smell of lasagna that cooked itself while you were out. This slow cooker lasagna delivers all the classic, layered goodness with a hands-off approach. You simply layer the uncooked noodles with a hearty spinach and ricotta filling and let your crockpot do the work.
Prep & Cook Time
- Prep Time: 15 minutes
- Cook Time: 195 minutes (3 hours 15 minutes)
- Total Time: 210 minutes (3.5 hours)
- Servings: 6
Ingredients
- 2 cups partly skim ricotta
- 3 garlic cloves (minced)
- ¼ tsp dried oregano
- ½ tsp pepper
- ¼ tsp red pepper flakes (optional)
- ½ cup Parmesan cheese (shredded)
- 1 can diced tomatoes (28oz can, drained)
- 3 ½ cups pasta sauce
- 1 handful flat leaf parsley (chopped)
- 3 cups mozzarella cheese (shredded)
- 4 cups baby spinach
Instructions
- In a medium bowl, mix together the ricotta, minced garlic, oregano, pepper, red pepper flakes (if using), shredded Parmesan, and chopped parsley.
- In a separate bowl, combine the drained diced tomatoes and pasta sauce.
- Spread about 1 cup of the tomato-sauce mixture evenly over the bottom of your slow cooker.
- Layer ingredients in this order, pressing down gently after each: a single layer of uncooked lasagna noodles (break them to fit), half of the ricotta mixture, half of the baby spinach, 1 cup of mozzarella cheese, and about 1 cup of sauce.
- Repeat the layers: noodles, the remaining ricotta mixture, the remaining spinach, 1 cup of mozzarella, and 1 cup of sauce.
- Top with a final layer of noodles, the remaining sauce, and the remaining 1 cup of mozzarella cheese.
- Cover and cook on LOW for 3 hours 15 minutes (195 minutes), or until noodles are tender. Uncover and let stand for 15-20 minutes before serving to allow it to set.
Variations
- Vegetable Swap: Instead of layering the spinach, wilt it and mix it directly into the ricotta cheese mixture for more integrated flavor.
- Meaty Addition: For a meaty version, brown 1 pound of ground beef or Italian sausage, drain the fat, and stir it into the pasta sauce mixture before layering.
- Crispy Top: For a browned, crispy cheese top, carefully transfer the finished lasagna to a broiler-safe dish and broil for 2-3 minutes after the slow cooking is complete.
- Individual Portions: Use small, stackable dishes to create single-serving lasagnas, adjusting the cooking time downward as needed.
Tips for Success
- Ensure every noodle edge is covered with sauce to prevent dry, crunchy bits.
- Letting the lasagna rest for 15-20 minutes after cooking is crucial for clean slices.
- A 6-quart oval slow cooker is ideal for this recipe. If using a round one, you may need to break more noodles to fit the shape.
Storage & Reheating
Store cooled leftovers in an airtight container in the refrigerator for up to 4 days. To reheat, place individual portions on a microwave-safe plate and heat until warmed through, or cover a larger portion with foil and reheat in a 350°F oven for 20-25 minutes.
FAQ
Can I cook this on HIGH?
Yes, you can cook on HIGH for approximately 1 hour 45 minutes to 2 hours, but LOW is recommended for more even cooking and tender noodles.
Do I really not have to cook the noodles?
Why did my lasagna come out watery?
This is often due to using canned tomatoes that weren’t drained or a pasta sauce with a very high water content. Ensure you drain the diced tomatoes well.
Can I assemble this ahead of time?
Yes, you can layer everything in the slow cooker insert, cover tightly, and refrigerate overnight. Let it sit at room temperature for 20-30 minutes before starting the cooker.
Can I freeze the leftovers?
Absolutely. Portion the cooled lasagna, wrap tightly in plastic wrap and foil, and freeze for up to 3 months. Thaw in the refrigerator overnight before reheating.

