Kalyn's Kitchen

Mock Lasagna Spaghetti Squash Casserole

Mock Lasagna Spaghetti Squash Casserole is serious low-carb comfort food, and you definitely won’t miss the carbs! We used spicy Italian sausage and three kinds of cheese in this tasty mock lasagna. 

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Mock Lasagna Spaghetti Squash Casserole finished dish with one serving on plate

Mock Lasagna Spaghetti Squash Casserole is a low-carb 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 recipe is quite low in net carbs, and of course it’s much lower in carbs than traditional lasagna, and if you’re in need of some 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 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!

Mock Lasagna Spaghetti Squash Casserole finished dish with one serving on plate

Mock Lasagna Spaghetti Squash Casserole

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

This 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 Spaghetti Squash or Casseroles to 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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    49 Comments on “Mock Lasagna Spaghetti Squash Casserole”

  1. Love it ! Made it the first time when I had friends over that are watching carbs.. they loved it so much they made it the following week. Such an easy recipe 
    Thanks so much 

  2. This is amazing!!!! Even my non squash eating husband was in love with this dish. I didn’t add meat and it wasn’t missed at all. Honestly enjoyed this as much if not more than traditional lasagna. Squeezing all of the liquid out of the squash makes all the difference in the world for the end product. Could not love this more!!!!!