This simple chicken alfredo spaghetti squash casserole is filled with broccoli and onions, and perfect for meal prep or a weeknight chicken dinner recipe. It’s Whole30, paleo, keto/low carb, gluten free and dairy free, all while being a delicious, hearty and vegetable-filled meal! It comes together very easily, and reheats well.
This post is in partnership with Primal Kitchen. They’re giving you 10% off any of their products using the code “PALEOBAILEY” at checkout! I’m happy to work with a company I love, use and believe in so much. Thanks for your support here on the blog and your support for Primal Kitchen!
Whole30 Chicken Alfredo Spaghetti Squash Casserole Ingredients
This chicken casserole recipe is super simple to make, and doesn’t require many ingredients. You’ll need a pound of chicken breasts, a few cups of broccoli, an onion and a spaghetti squash, plus a few spices like salt and garlic powder. Everything is combined and baked with Primal Kitchen’s Dairy-Free Garlic Alfredo!
Primal Kitchen’s Garlic Alfredo is one of the sauces I love keeping in the pantry for quick and easy meals. It’s made with velvety cashew butter, and it’s Paleo, keto, gluten and dairy-free. I use it all the time, like in this Chicken Bacon & Potato Casserole! Primal Kitchen doesn’t use any junky ingredients in their sauces, so it’s perfect for our family or anyone needing a healthier option!
You can get it for free as a part of the Whole Kitchen Sink bundle (all of my most favorite Primal Kitchen sauces!), or on it’s own on their website! Use the code PALEOBAILEY for a discount!
How to Make Alfredo Spaghetti Squash Casserole
You’ll first start by preparing the spaghetti squash. Do this by cutting it in half lengthwise and then scooping out the seeds into the trash. Then, season with salt and pepper, coat with a light layer of cooking oil spray and place onto a baking sheet. Put the baking sheet into the oven on an upper rack.
Once the squash is in the oven, add the chicken breasts and diced onion into a casserole dish. Toss with salt and pepper and add the casserole dish into the oven and continue baking for 30 minutes on 400 degrees F. Once the half hour is up, remove the baking sheet and casserole dish from the oven. Remove the chicken, dice and return to the casserole dish.
Related: Homemade Whole30 Alfredo Sauce (Dairy-Free)
Turn over the spaghetti squash and use a fork to “thread” the squash into strands directly into the casserole dish. Once all of the squash is in the casserole dish, add in the broccoli florets, spices and Primal Kitchen Alfredo Sauce. Use two forks to combine the sauce in with the chicken and vegetables. Place the dish back into the oven and bake for the remaining 30 minutes.
When it’s done, it will be a light golden brown on top and the sauce bubbling at the sides.
Other Healthy Casserole Recipes You’ll Love:
Creamy Sausage & Potato Casserole
Creamy Dijon Chicken Casserole
PrintChicken Alfredo Spaghetti Squash Casserole: Whole30, Paleo, Low Carb, GF
This simple chicken alfredo spaghetti squash casserole is filled with broccoli and onions, and perfect for meal prep or a weeknight chicken dinner recipe. It’s Whole30, paleo, keto/low carb, gluten free and dairy free, all while being a delicious, hearty and vegetable-filled meal! It comes together very easily, and reheats well.
- Prep Time: 15
- Cook Time: 60 minutes
- Total Time: 1 hour 15 minutes
- Yield: Serves 4
- Category: Chicken
- Method: Oven
- Cuisine: Casserole
- Diet: Gluten Free
Ingredients
- 1 lb boneless, skinless chicken breasts
- 1 medium white onion, diced
- 1 medium sized spaghetti squash
- 1 jar Primal Kitchen Garlic Alfredo Sauce (or homemade Whole30/Dairy-Free Alfredo)
- 3 cups broccoli florets
- 1/2 tsp salt (plus more for seasoning chicken)
- 1/2 tsp garlic powder
- 1/2 tsp pepper (plus more for seasoning chicken)
- 1/2 tbsp olive oil (or avocado oil)
Instructions
- Preheat oven to 400 degrees F.
- Cut the spaghetti squash in half lengthwise, scrape out the seeds, and spray the cut sides with a bit of cooking oil and add a sprinkle of salt. Then place the squash cut side down onto a baking sheet and place into the oven on an upper rack
- Add the chicken breasts, diced onion and oil into a large casserole dish. Sprinkle with salt and pepper and toss to coat the chicken and onion and then place into the oven on a lower rack
- Bake for 30 minutes
- Remove the casserole dish and baking sheet. Dice the chicken breasts and add back into the casserole dish. Use a fork to scrape the spaghetti squash “threads” from each half into the casserole dish (it’s okay if the squash isn’t fully cooked yet).
- Then, add the alfredo sauce, broccoli, salt, pepper and garlic powder to the dish. Use two forks to stir everything together and combine all of the ingredients
- Place back into the oven and bake for an additional 30 minutes, or until the top is slightly golden brown
- Remove, dish into bowls and enjoy!
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Tara says
I made this casserole last night. The flavors were great, but I was disappointed in how liquidy the casserole was. I’m wondering if that’s because I used frozen broccoli. Is the casserole supposed to have quite a bit of liquid to it. If not, do you think it’s because of the broccoli.
Aaryka says
This was so good! I couldn’t find the garlic Alfredo sauce at my store but they had regular Alfredo sauce and I added minced garlic and it was amazing, not to mention how easy it was to make! Definitely making this again!
paleobailey says
I’m SO happy to hear this! Thank you so much for giving it a try and taking the time to let me know you enjoyed it! <3 - B
imsen says
I made this for dinner last Wednesday and it was delicious! I’m pretty sure it’s my new favorite way to eat spaghetti squash! 🙂
This was amazing! My husband raved about and asked me to make it again two days later 🙂
Donna says
This is so good. And easy. Loved it.
paleobailey says
I’m so glad you enjoyed it! Thank you so much, Donna!
Rosie says
Could I sub chicken thighs for the breasts? If so, would that impact the cooking time or the preparation? Thanks!
paleobailey says
You can! I don’t think it would change anything for cooking time – but for prep you’d still have to cook and either shred or dice!
Susan says
This is delicious and will be on repeat at our house!
Stuart says
This is an all time favorite in our house! This casserole is a perfect healthier take on comfort food that tastes so good!