This Italian Inspired Sausage & Spaghetti Squash Casserole is a Family Favorite!

Italian Sausage & Spaghetti Squash Casserole

yield: 12 SERVINGS

prep time: 30 MINUTES

cook time: 1 HOUR 10 MINUTES

total time: 1 HOUR 40 MINUTES

Ingredients

  • 1 medium spaghetti squash, about 3 to 3 1/2 lbs whole (approx 5 cups cooked)
  • 1 1/2 pounds ground Italian sausage
  • 1/2 cup onion, finely diced
  • 1/2 cup orange or red bell pepper, finely diced
  • 3 cloves garlic, minced
  • 24 oz jar no-sugar-added pasta sauce (or use your favorite homemade sauce)
  • 1 egg
  • 1/2 cup grated Parmesan cheese
  • 4 cups shredded mozzarella cheese, divided
  • 1/2 teaspoon onion powder
  • 1/2 teaspoon garlic powder
  • 1/2 teaspoon black pepper
  • 1/2 teaspoon salt

Directions

1

This casserole will require a 9x13 inch casserole dish (you may prep it with non-stick cooking spray if desired).

2

Preheat the oven to 400-degrees. Line a baking sheet with parchment paper or tin foil. Halve the squash (lengthwise or widthwise) and scoop out the seeds. Sprinkle the halves with a bit of salt. Place squash halves cut side down on a baking sheet.

3

Bake squash in preheated oven for about 35-40 minutes or until it's easily pierced with a knife. Remove from oven and cool until easily handled. Use a fork to scrape out the "spaghetti" into a mixing bowl.

4

To the squash, add egg (beaten), Parmesan cheese, onion powder, garlic powder, black pepper, and salt. Mix well. Set aside. Reduce oven temperature to 375-degrees in preparation for the casserole.

5

In a large to medium pot, over medium-high heat, brown the Italian sausage until just done. Do not drain. Add the onion, bell pepper, and garlic. Cook for another 3-5 minutes until the onions become translucent.

Remove from heat. Add the 24 oz jar of pasta sauce. Mix thoroughly. Set aside.

6

Grab your casserole dish and begin layering.

First, add about 2/3 cup of meat sauce to the bottom of the dish, and spread evenly. Next, layer half the spaghetti squash mixture on top of the meat sauce using a fork to evenly press it into a uniform thickness, almost as if it's acting as a lasagna noodle.

Top the squash layer with half of the remaining meat sauce, and spread evenly. Now sprinkle 2 cups of the shredded mozzarella cheese over the meat sauce.

7

Spread the remaining squash mixture using the same technique as above, followed by the rest of the meat sauce. Sprinkle the last 2 cups of mozzarella cheese evenly over the meat layer.

8

Bake in preheated, 375-degree oven until cheese is bubbly and golden brown, about 25-30 minutes.

9

Let cool for at least 10 minutes. This allows the casserole to be set up so that each serving comes out clean and beautiful. Enjoy!

Nutrition Information

Yield: 12 servings, Serving Size: 1 cup
Amount Per Serving: 351 Calories | 25.5g Fat | 11g Total Carbs | 2.4g Fiber | 5.2g Sugar | 20.2g Protein | 8.6g Net Carbs

Brought to you by Hip2Keto.

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More Spaghetti Squash
19 Comments
4.9 / 9 ratings
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This Italian sausage and spaghetti squash casserole needs to be added to your dinner rotation. 

Keto Italian Sausage and Spaghetti Squash Casserole - large serving of casserole being scooped out of hot pan

My Italian grandmother, known as Ma, was an incredible cook.

She was always fussing over a hot stove. My heart sang for dinner at Ma’s house, whether it was sausage with peppers, slow-cooked pork in hearty ragu, or eggplant parmesan with a side of pesto linguine. Anytime I have an opportunity to create an Italian dish, I’m inspired by her garlic-lovin’ roots and freestyle cooking that always turned out amazing.

This Italian sausage & spaghetti squash casserole is pretty basic, however, the taste is rich, hearty, and classic. I think Ma would approve.

Keto Italian Sausage and Spaghetti Squash Casserole - young boy eating a large bit of Italian squash casserole

Oh, and did I mention the kiddos love it, too?

I never thought my son would devour squash by the handful! The cooking process is simple but the presentation and flavors are pretty extraordinary… My low-carb bestie is spaghetti squash, and the whole family loves it! I don’t miss noodles at all with this recipe.

spaghetti squash and Italian sausage casserole

A few tips when making this Italian spaghetti squash casserole:

  • When layering the squash, I use a fork to smooth it out as even and flat as possible. I feel this method creates a nice density that truly replaces the need for a noodle.
  • For the first time, I tried Ragu Simply Traditional Pasta Sauce. It’s sugar-free and made with 100% olive oil. I was surprised how much I liked it with the Italian sausage mixture. I definitely recommend it for a quick and easy option.

spaghetti squash

spreading spaghetti squash into casserole dish

keto italian dish

plate of casserole


Print

Italian Sausage & Spaghetti Squash Casserole

yield: 12 SERVINGS

prep time: 30 MINUTES

cook time: 1 HOUR 10 MINUTES

total time: 1 HOUR 40 MINUTES

The cooking process is simple, but the presentation and flavors are pretty extraordinary.

Ingredients

  • 1 medium spaghetti squash, about 3 to 3 1/2 lbs whole (approx 5 cups cooked)
  • 1 1/2 pounds ground Italian sausage
  • 1/2 cup onion, finely diced
  • 1/2 cup orange or red bell pepper, finely diced
  • 3 cloves garlic, minced
  • 24 oz jar no-sugar-added pasta sauce (or use your favorite homemade sauce)
  • 1 egg
  • 1/2 cup grated Parmesan cheese
  • 4 cups shredded mozzarella cheese, divided
  • 1/2 teaspoon onion powder
  • 1/2 teaspoon garlic powder
  • 1/2 teaspoon black pepper
  • 1/2 teaspoon salt

Directions

1

This casserole will require a 9x13 inch casserole dish (you may prep it with non-stick cooking spray if desired).

2

Preheat the oven to 400-degrees. Line a baking sheet with parchment paper or tin foil. Halve the squash (lengthwise or widthwise) and scoop out the seeds. Sprinkle the halves with a bit of salt. Place squash halves cut side down on a baking sheet.

3

Bake squash in preheated oven for about 35-40 minutes or until it's easily pierced with a knife. Remove from oven and cool until easily handled. Use a fork to scrape out the "spaghetti" into a mixing bowl.

4

To the squash, add egg (beaten), Parmesan cheese, onion powder, garlic powder, black pepper, and salt. Mix well. Set aside. Reduce oven temperature to 375-degrees in preparation for the casserole.

5

In a large to medium pot, over medium-high heat, brown the Italian sausage until just done. Do not drain. Add the onion, bell pepper, and garlic. Cook for another 3-5 minutes until the onions become translucent.

Remove from heat. Add the 24 oz jar of pasta sauce. Mix thoroughly. Set aside.

6

Grab your casserole dish and begin layering.

First, add about 2/3 cup of meat sauce to the bottom of the dish, and spread evenly. Next, layer half the spaghetti squash mixture on top of the meat sauce using a fork to evenly press it into a uniform thickness, almost as if it's acting as a lasagna noodle.

Top the squash layer with half of the remaining meat sauce, and spread evenly. Now sprinkle 2 cups of the shredded mozzarella cheese over the meat sauce.

7

Spread the remaining squash mixture using the same technique as above, followed by the rest of the meat sauce. Sprinkle the last 2 cups of mozzarella cheese evenly over the meat layer.

8

Bake in preheated, 375-degree oven until cheese is bubbly and golden brown, about 25-30 minutes.

9

Let cool for at least 10 minutes. This allows the casserole to be set up so that each serving comes out clean and beautiful. Enjoy!

Nutrition Information

Yield: 12 servings, Serving Size: 1 cup
Amount Per Serving: 351 Calories | 25.5g Fat | 11g Total Carbs | 2.4g Fiber | 5.2g Sugar | 20.2g Protein | 8.6g Net Carbs

Brought to you by Hip2Keto.

Keto Italian Sausage and Spaghetti Squash Casserole – plated and ready to serve

This spaghetti squash casserole is a game changer!

This dish is seriously so delicious! If someone in your life is hesitant about trying a keto dish or spaghetti squash in general, make them this dish. I guarantee it will win them over!

This would also be great to bring to some sort of gathering or potluck. There might be some fighting for seconds, though.

Spaghetti squash and Italian sausage casserole on plate

My sis Collin also loves this recipe! Here’s what she had to say:

“Oh my… this is one of my favorite go-to Italian recipes! If you miss pasta night, this recipe will have you no longer missing it again. This casserole totally hits the spot. It’s so flavorful too, and the leftovers are SO good! Make it – you won’t regret it!” – Collin


Love sausage? Try these Cream Cheese Sausage Balls!


About the writer:

Marley follows a ketogenic diet and loves to experiment with new and exciting keto-friendly meals when she's not busy with her 3 children!


Join The Discussion

Comments 19

  1. Susan

    I appreciate your tip about using Ragu Traditional Pasta Sauce for this recipe. My family loves anything pasta/tomato-based! However, finding sugar-free pasta sauces has been a challenge. I can’t wait to purchase Ragu’s sugarfree sauce and to test out this recipe :).

    • Marley (Sister Sidekick)

      Susan, you betcha! And for variety, I also like Newman’s Own pasta sauces. Like Ragu’s Simply line, Newman’s Own is also free of added sugar. Woot, woot!

  2. Karen

    I had this tonight. It was awesome! My husband didn’t even know about the squash!

    • Marley (Sister Sidekick)

      Yay for sneaky squash! 😉

  3. Jennifer Snyder

    This is the BOMB!!! My son didn’t even notice it was spaghetti squash. This is definitely a must in my rotation!!

    • Collin (Mrs. Hip)

      Yay! SO glad this was a hit! Thanks a ton for the feedback, Jennifer!

  4. alexandra

    Could you substitute butternut squash?

    • Marley (Sister Sidekick)

      Hi there Alexandra. Great question! I avoid winter squash on keto as it is much higher in carbs compared to zucchini, yellow (summer) squash, spaghetti squash, and pumpkin. For reference, spaghetti squash is only 5.5 net carbs per cup while butternut squash is a mountainous 13 net carbs per cup. Hope that’s helpful information!

  5. Miss Kitty

    I made this tonight for my family. It was so delicious! I tweaked it and made it my own, but oh yes….this was a super great idea for a dinner meal. Couple of little things I did, first I used a roll of breakfast sausage because that’s what I had on hand. I cooked the sausage, one yellow pepper, half a medium onion and garlic powder all together. While that was cooking, I put my spaghetti squash in the insta pot for 8 minutes. The meat and squash were done about the same time so I started my layering. I did use 8oz of cottage cheese with an egg mixed in as one of my layers. I layered mine more like a lasagna style. Squash, meat sauce mixture, cottage cheese mixture, cheese, repeat. So thank you so much for this recipe idea!! My non veggie eating nephew had two servings! We loved it!

    • Marley (Sister Sidekick)

      Hi Kitty. I’m so glad you enjoyed it. Sounds like your customizations were a hit—Well done!

  6. Jennifer Brown

    Could you cut down cooking time by using an instant pot?

    • Cassandra (Hip Sidekick)

      Certainly, Jennifer. You would just need to adjust the cooking time as the IP cooks much faster. Hope that helps!

  7. SDL

    OMG Marley!!!!!! I had to leave a review for you after making this. I made this over the weekend, and have eaten it everyday for lunch and dinner!! Its sooo delicious. I substituted the Italian sausage with beef breakfast sausage. I did need to drain a little of the fat off before adding the sauce, but my end results turned out perfect! I also made a salad to complement it. Boom! I will be making this again for sure. **The spaghetti squash is a hidden gem. Thanks so much for this!! Be blessed!

    • Amber (Hip Sidekick)

      Aww, Thanks so much for the sweet comment and feedback! I’ll be sure to pass this along! 💕 We’re super glad you enjoyed it!

  8. Kristen

    This is absolutely delicious! We’ve made it at least 6 times, maybe more. Our teenagers and company who ate it loved it too. Put into our normal rotation for sure!

    • Collin (Mrs. Hip)

      Yay! SO glad to hear how yummy it was! Happy you can add it to your regular line up!

  9. Darby

    I enjoyed this recipe! I totally forgot to add the egg and I used Paul Newman Tomato and Basil sauce. I’ll definitely make it again. I’m not on the keto diet, just looking for something new to do with spaghetti squash, but I am no longer a pasta eater. This was perfect! Thank you!

    • Jennifer (Hip Sidekick)

      Even if you are not keto, this is a great one to enjoy!

  10. Lisa

    That looks delicious!

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