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Kalyn's Kitchen

Low-Carb Mock Lasagna Spaghetti Squash Casserole

This Low-Carb Mock Lasagna Spaghetti Squash Casserole is serious comfort food, and we used spicy Italian sausage and three kinds of cheese in this spaghetti squash mock lasagna. Use Spaghetti Squash to find more recipes like this one.

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Low-Carb Mock Lasagna Spaghetti Squash Casserole [KalynsKitchen.com]

Low-Carb Mock Lasagna Spaghetti Squash Casserole is a casserole I created a few years ago that has spaghetti squash replacing lasagna noodles, and this recipe really knocked our socks off when we tested it! This does have a few more carbs than some of my casserole recipes but of course it’s much lower in carbs than traditional lasagna, and if you’re in need of some low-carb comfort food to help you get through December, I promise this will hit the spot.

In this mock lasagna idea the traditional lasagna ingredients are layered with cooked spaghetti squash, and Mock Lasagna Spaghetti Squash Casserole has the same flavors that make lasagna such a popular dish! If you like these lasagna flavors and you’re looking for dinner ideas to keep you at least somewhat on track during the holidays, I promise this will be a winner! I’d love to hear how your family likes it if you try the recipe!

Low-Carb Mock Lasagna Spaghetti Squash Casserole process shots collage

How to Make Low-Carb Mock Lasagna Spaghetti Squash Casserole:

(Scroll down for complete printable recipe.)

  1. I roasted two spaghetti squashes for this, but in the end I realized if you have one large one (about 4 pounds), it will be plenty for the casserole.  Microwave the squash about 5 minutes to soften, cut the spaghetti squash in half, scrape out seeds, rub with olive oil and Italian herb blend, and roast 50-60 minutes.  (If you want an easier method, you can cook the spaghetti squash in a crockpot  or cook the spaghetti squash in a pressure cooker for this recipe.)
  2. While the squash cooks, squeeze the turkey sausage out of the casings and brown well.  Add the marinara sauce, dried basil, Italian herb blend, and garlic powder and simmer until the liquid is mostly evaporated, about 30 minutes.  (Rao’s Pasta Sauce – affiliate link – is the lowest carb sauce I’ve found.)
  3. Mix together the cottage cheese, eggs, and Italian Herb blend.
  4. Make a layer of half the spaghetti squash in an 8 inch x 11 inch casserole dish. 
  5. Top with half the sauce, half the cottage cheese mixture, and half the cheese.
  6. Then make another layer of spaghetti squash, sauce, cottage cheese mixture, and the rest of the cheese. 
  7. Bake uncovered at 375F/190C for about 45 minutes.  (Mine got a little brown on the edges, but that didn’t bother us a bit.)
  8. Serve hot and devour!

Low-Carb Mock Lasagna Spaghetti Squash Casserole thumbnail photo

More Low-Carb Dinners with Spaghetti Squash:

Mediterranean Spaghetti Squash Sauteed with Vegetables and Feta ~ Kalyn’s Kitchen
Roasted Spaghetti Squash with Sausage ~ White on Rice Couple
Greek Salad Spaghetti Squash Bowl ~ Kalyn’s Kitchen
Low-Carb Slow Cooker Spaghetti Squash and Meatballs ~ All Day I Dream About Food
Roasted Spaghetti Squash with Mizithra Cheese and Browned Butter ~ Kalyn’s Kitchen

Weekend Food Prep:

This recipe has been added to a new category called Weekend Food Prep  to help you find recipes you can prep or cook on the weekend and eat during the week!

Low-Carb Mock Lasagna Spaghetti Squash Casserole

Low-Carb Mock Lasagna Spaghetti Squash Casserole

Yield 8 servings
Prep Time 1 hour 15 minutes
Cook Time 45 minutes
Total Time 2 hours

This Low-Carb Mock Lasagna Spaghetti Squash Casserole is serious comfort food, and you won’t miss the carbs in this tasty "lasagna" that features spaghetti squash.


Spaghetti Squash Ingredients:

  • 1 large spaghetti squash, about 4 pounds
  • 2 tsp. olive oil (for brushing squash)
  • 2 tsp. Italian Herb Blend (for sprinkling on squash before roasting)

Sauce Ingredients:

  • 2 tsp. olive oil
  • 19.5 oz. pkg. hot turkey Italian Sausage
  • 3 cups marinara sauce (see notes)
  • 1 tsp. dried basil
  • 1 tsp. Italian Herb Blend
  • 1 tsp. garlic powder (or use minced fresh garlic if you prefer)

Casserole Ingredients:

  • 2 cups cottage cheese
  • 2 eggs
  • 1 tsp. Italian Herb Blend
  • 2 cups grated Mozzarella
  • 1/2 cup coarsely grated Parmesan cheese


  1. Preheat oven to 400F/200C.
  2. If desired, microwave the spaghetti squash for about 5 minutes (to soften the skin so it’s easier to cut.)  Cut squash in half lengthwise and scrape out the seeds.  Brush the inside of each half with olive oil and sprinkle with Italian Herb Blend.
  3. Roast the squash on a flat baking sheet about 50-60 minutes, or until the squash strings apart easily with a fork.  (You can also cook the spaghetti squash in a crockpot or cook the spaghetti squash in a pressure cooker for this recipe.)
  4. While the squash cooks,  heat the olive oil in a large non-stick frying pan, squeeze the turkey sausage out of the casings, and brown sausage well, breaking it apart with a turner while it cooks. (I like to use an old-fashioned Potato Masher (affiliate link) to break the sausage apart.)
  5. When the sausage is well-browned, add the 3 cups of sauce, dried basil, Italian Herb Blend, and garlic powder, and simmer on low until most of the liquid has evaporated, about 30 minutes.
  6. Put the cottage cheese into a bowl, add the eggs and Italian Herb Blend, and mix with a fork until the egg is well-mixed into the cottage cheese.
  7. Prepare grated Mozzarella and coarsely grated Parmesan.
  8. Spray an 8 inch by 11 inch casserole dish with non-stick spray.
  9. When the spaghetti squash is done, turn oven heat down to 375F/190C and let squash cool for a few minutes.  Then use a fork to scrape the squash away from the skin, separating it into strands of “spaghetti.”  Discard the skin.
  10. In the casserole dish, layer half the spaghetti squash, half the reduced sauce mixture, half the cottage cheese mixture, half the Mozzarella, and half the Parmesan.
  11. Repeat with another layer each of squash, sauce, cottage cheese mixture, Mozzarella, and Parmesan.
  12. Bake uncovered until the casserole is bubbling hot and the cheese is melted and lightly browned, about 40-45 minutes.
  13. Serve hot, with additional Parmesan cheese to add at the table if desired.


Use a 24 oz. jar or homemade marinara sauce. For purchased sauce I recommend Rao's Pasta Sauce (affiliate link) which has only 20 carbs in the whole bottle.

Recipe created by Kalyn.

Nutrition Information:



Serving Size:


Amount Per Serving: Calories: 421Total Fat: 23gSaturated Fat: 8gUnsaturated Fat: 11gCholesterol: 149mgSodium: 1419mgCarbohydrates: 13.2gFiber: 4gSugar: 10gProtein: 34g

Nutrition information is automatically calculated by the Recipe Plug-In I am using. I am not a nutritionist and cannot guarantee 100% accuracy, since many variables affect those calculations.

If you make this recipe I'd love to hear how it turns out. Leave a star rating or share on social media with the hashtag #KALYNSKITCHEN, thanks!

Low-Carb Diet / Low-Glycemic Diet / South Beach Diet Suggestions:
If you’re making this for the South Beach Diet, they would recommend using low-fat cottage cheese and low-fat Mozzarella (as well as low-fat turkey Italian sausage.)  For other types of low-carb diets, use full-fat cheese if you prefer, but I would prefer the less fatty turkey sausage for this recipe. 

Find More Recipes Like This One:
Use the Recipes by Diet Type photo index pages to find more recipes suitable for a specific eating plan. You might also like to Follow Kalyn’s Kitchen on Pinterest to see all the good recipes I’m sharing there.

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    41 Comments on “Low-Carb Mock Lasagna Spaghetti Squash Casserole”

  1. I have made this dish at least a half dozen times in the last year. I have made it exactly as instructed, with ricotta instead of cottage cheese and also with a blend of the two. I’ve layered the cheeses and also mixed them together. I’ve found my favorite is to use cottage cheese and mix the mozzarella and Parm in and them add a little extra of each sprinkled on the top. Even my fairly picky 7 year old says “it’s amazing!” Every time. Thanks, Kalyn!!

  2. This recipe looks amazing! I’m trying to print it, but the link isn’t working for me?

  3. Delicious! I make it with ricotta cheese which has a lot more protein than cottage cheese.

  4. This recipe looked delicious so I made it for dinner tonight. Afterwards I was entering the info in my carb tracker and checked out the nutritional info on Yummly and was so disappointed to see this has 33g carbs per serving yet is listed as a low carb meal. That’s a super high amount for one meal. It was good but I won’t be making it again.

    • Analyzing nutritional information correctly is so difficult, but that isn’t close to correct. The problem with Yummly and other calculators is that they don’t know exactly what ingredients you use. So for “marinara sauce” they don’t realize you’re using a low-sugar sauce.

      [Edited November 2019] I have now started calculating carbs for the recipes so you can see it in this post, based on the ingredients I used.

    • Carbs are good for you so eat up! It take carbs, fat, and protein to be healthy and lean. I am a certified personal trainer and I know this to be accurate. 

      • Paula, the motto of my site is “everyone gets to make their own food choices.” So I don’t recommend people eat carbs or avoid them. They get to decide that for themselves.

  5. Making it right now with ricotta cheese. I think I will squeeze the squash with paper towel to get out water.

  6. Thanks for the delicious recipe my first time having spaghetti squash and I’m hooked

  7. This was absolutely delectable. Both the Husband and I declared the recipe a keeper. The left-overs were just as good, if not better than the first sitting. I must confess, I did sub ricotta for the cottage cheese, as it is more traditional for me than cottage cheese (and I don’t like cottage cheese at all!) in lasagna. Thanks for another great recipe!!!

  8. I would love to try this but my son is allergic to eggs. Do you have any suggestion for egg substitute?

    • Really the only purpose of the egg is to help the casserole hold together better. I'd just make it without the egg, knowing you'll have to take the pieces out a bit more carefully when you serve it. I think it will still taste great. Hope you enjoy!

  9. I made this for lunch today and it's amazing. I tweaked it by using low fat cottage cheese and part-skim milk. Then veggie crumbles instead of meat along with a ton of spinach tossed into the cottage cheese mixture. This is wonderful. I think it will be even better twice baked! Thanks so much!

  10. What temp do you bake the lasagna once assembled? 375 or 400?

  11. Wonder what I could sub for the cottage cheese, cannot do sheep or cow dairy. I will use buffalo mozzarella for the cheese part. This sounds delightful.

  12. THIS WAS AMAZING AND SO STINKING SIMPLE!!!! Thank you so much.

  13. I loved this recipe! Trying to be healthy to lose some weight and pasta is a vice… so I've now fallen in love with spaghetti squash. This recipe is just like lasagna… even better the following days!

  14. Made this tonight and it was wonderful! I went the lazy route and microwaved the squash for 12 minutes instead of roasting and it turned out fine. Thanks for the creation 🙂

  15. I made this last night and it was delicious! My only problem was it was a little watery, I am thinking that maybe it was the cottage cheese.

  16. We are looking for healthy choices that hold up well to freezing individual portions for work lunches. Do you know if this delicious-sounding recipe will freeze well?

    • Yes, I definitely think this will freeze well. By the way, you can look for the tag "Can Freeze" at the end of posts to see which things I think will freeze well or see thumbnails of all those freezer-friendly recipes on the page for Can Freeze. Hope that is helpful for you; I'm excited about this new feature!

  17. This is making me hungry! Can I find this squash this time of year??? If so, this will be on my table this weekend!

  18. Spaghetti squash is very high on my list for January (as you'll see in my posts later this month). For speed, I cook it in the pressure cooker, but oven roasting brings out more of the natural sweetness.