Chicken Alfredo Spaghetti Squash Casserole: Whole30, Paleo, Low Carb, GF
This Chicken Alfredo Spaghetti Squash Casserole: Whole30, Paleo, Low Carb, GF is a game changer for your weeknight dinners! It combines tender chicken with the unique texture of spaghetti squash, all enveloped in a creamy Alfredo sauce. Packed with broccoli and onions, this dish is both nutritious and satisfying. Ideal for meal prep or a cozy family dinner, it’s gluten-free and dairy-free while remaining deliciously flavorful.
Why You’ll Love This Recipe
- Healthy Ingredients: This casserole uses wholesome ingredients that are perfect for Whole30 and paleo diets.
- Easy to Prepare: With just a few simple steps, you can have a hearty meal ready in no time.
- Versatile Meal: Perfect as a main dish or paired with a side salad, making it great for any occasion.
- Meal Prep Friendly: It reheats beautifully, making it ideal for lunches throughout the week.
- Low Carb Delight: A great option for those following low carb or keto lifestyles without sacrificing taste.

Tools and Preparation
Preparing your Chicken Alfredo Spaghetti Squash Casserole requires some essential tools. Having the right equipment makes cooking easier and more enjoyable.
Essential Tools and Equipment
- Casserole dish
- Baking sheet
- Fork
- Knife
- Cooking spray
Importance of Each Tool
- Casserole dish: This tool holds all your ingredients together during baking, ensuring even cooking.
- Baking sheet: Useful for roasting the spaghetti squash evenly without mess.
- Fork: Perfect for scraping out the spaghetti squash threads effortlessly.
- Knife: Essential for dicing chicken and chopping vegetables accurately.
Ingredients
Here’s what you’ll need to create this delightful Chicken Alfredo Spaghetti Squash Casserole:
For the Protein
- 1 lb boneless, skinless chicken breasts
For the Vegetables
- 1 medium white onion, diced
- 3 cups broccoli florets
- 1 medium sized spaghetti squash
For the Sauce
- 1 jar Primal Kitchen Garlic Alfredo Sauce (or homemade Whole30/Dairy-Free Alfredo)
Seasoning
- 1/2 tsp salt (plus more for seasoning chicken)
- 1/2 tsp garlic powder
- 1/2 tsp pepper (plus more for seasoning chicken)
For Cooking
- 1/2 tbsp olive oil (or avocado oil)
How to Make Chicken Alfredo Spaghetti Squash Casserole: Whole30, Paleo, Low Carb, GF
Step 1: Preheat the Oven
Preheat your oven to 400 degrees F. This will ensure that everything cooks evenly.
Step 2: Prepare the Spaghetti Squash
- Cut the spaghetti squash in half lengthwise.
- Scrape out the seeds using a knife or spoon.
- Spray the cut sides with cooking oil and sprinkle with salt.
- Place the squash cut side down onto a baking sheet and place it into the oven on an upper rack.
Step 3: Cook the Chicken and Onions
- In a large casserole dish, add the chicken breasts and diced onion.
- Drizzle with olive oil and season with salt and pepper.
- Toss to coat everything well before placing it into the oven on a lower rack.
Step 4: Bake Both Dishes
Bake for 30 minutes until everything is cooked through.
Step 5: Combine Ingredients
- Remove both dishes from the oven.
- Dice the cooked chicken breasts and return them to the casserole dish.
- Use a fork to scrape out spaghetti squash threads into the same dish; it’s okay if not fully cooked yet.
Step 6: Add Sauce and Broccoli
- Pour in the alfredo sauce over your mixture.
- Add broccoli florets along with salt, pepper, and garlic powder.
- Stir everything together until well combined.
Step 7: Final Bake
Return everything back to the oven and bake for another 30 minutes or until golden brown on top.
Step 8: Serve
Once cooked, remove from oven, dish into bowls, and enjoy your delicious Chicken Alfredo Spaghetti Squash Casserole!
How to Serve Chicken Alfredo Spaghetti Squash Casserole: Whole30, Paleo, Low Carb, GF
This Chicken Alfredo Spaghetti Squash Casserole is a versatile dish that can be served in various ways to enhance your meal experience. Whether you prefer a light salad on the side or additional veggies for a complete dinner, here are some serving suggestions.
Pair with Fresh Greens
- Mixed Green Salad: Toss together arugula, spinach, and kale with a simple vinaigrette for a refreshing contrast.
- Caesar Salad: A dairy-free Caesar salad will complement the creamy casserole without overpowering it.
Add Extra Veggies
- Roasted Brussels Sprouts: These add a nice crunch and flavor that pairs well with the casserole.
- Sautéed Zucchini: Lightly sauté zucchini with garlic and olive oil for a quick and easy side.
Enhance with Protein
- Grilled Shrimp: Lightly seasoned grilled shrimp can add an extra protein boost.
- Hard-Boiled Eggs: Sliced hard-boiled eggs on top can provide additional texture and nutrients.
How to Perfect Chicken Alfredo Spaghetti Squash Casserole: Whole30, Paleo, Low Carb, GF
To make your Chicken Alfredo Spaghetti Squash Casserole truly exceptional, consider these helpful tips for perfecting your dish.
- Use Fresh Ingredients: Fresh chicken breasts and veggies contribute significantly to flavor and nutrition.
- Don’t Overcook the Squash: Slightly undercooked spaghetti squash will finish cooking in the oven and retain its texture.
- Season Generously: Be sure to season both the chicken and vegetables adequately for maximum flavor.
- Experiment with Sauces: If you prefer homemade sauces, try making your own dairy-free alfredo sauce for added freshness.
- Let it Rest: Allowing the casserole to sit for 5-10 minutes after baking helps flavors meld together beautifully.
Best Side Dishes for Chicken Alfredo Spaghetti Squash Casserole: Whole30, Paleo, Low Carb, GF
Serving this flavorful casserole alongside complementary dishes can elevate your meal. Here are some great side options to consider.
- Garlic Roasted Asparagus: These tender stalks add vibrant color and flavor to your plate.
- Balsamic Glazed Carrots: Sweet carrots drizzled with balsamic reduce perfectly balance the savory casserole.
- Cucumber Tomato Salad: A cool salad made with diced cucumbers and tomatoes adds freshness.
- Steamed Broccoli: A simple steamed broccoli dish enhances the veggie profile of your meal.
- Zucchini Noodles: For an extra low-carb option, serve zoodles tossed in olive oil and herbs.
- Cauliflower Rice: This fluffy alternative serves as a light base under your casserole serving.
Common Mistakes to Avoid
When making Chicken Alfredo Spaghetti Squash Casserole, there are a few common errors that can affect the outcome. Here are some mistakes to be aware of:
- Skipping the seasoning: Failing to properly season the chicken can lead to bland flavors. Be sure to add enough salt and pepper to enhance the dish’s taste.
- Overcooking the spaghetti squash: Cooking the squash too long can make it mushy. Aim for al dente texture when scraping it into the casserole for the best bite.
- Not measuring ingredients: Eyeballing ingredients may result in imbalanced flavors or textures. Always measure your components, especially the sauce and seasonings.
- Ignoring the bake times: Each oven varies slightly, so keep an eye on your casserole while baking. Adjust bake time as necessary for a perfect golden top.
- Forgetting to combine well: If you don’t mix all ingredients thoroughly, you might end up with uneven flavors. Use two forks to ensure everything is evenly distributed.

Storage & Reheating Instructions
Refrigerator Storage
- Store leftovers in an airtight container.
- Consume within 4-5 days for optimal freshness.
Freezing Chicken Alfredo Spaghetti Squash Casserole: Whole30, Paleo, Low Carb, GF
- Freeze in a freezer-safe container.
- Best used within 2-3 months for flavor preservation.
Reheating Chicken Alfredo Spaghetti Squash Casserole: Whole30, Paleo, Low Carb, GF
- Oven: Preheat to 350°F and heat covered for about 20 minutes.
- Microwave: Use medium power and heat in short intervals until warmed through.
- Stovetop: Heat gently on low, stirring occasionally until hot.
Frequently Asked Questions
What makes Chicken Alfredo Spaghetti Squash Casserole ideal for meal prep?
This casserole is easy to prepare ahead of time and reheats well, making it perfect for busy weeknights or meal planning.
Can I customize Chicken Alfredo Spaghetti Squash Casserole?
Absolutely! You can add different vegetables like bell peppers or spinach based on your preferences.
Is Chicken Alfredo Spaghetti Squash Casserole suitable for special diets?
Yes! It’s Whole30, paleo, low carb, gluten-free, and dairy-free, catering to various dietary needs.
How do I ensure my spaghetti squash cooks properly?
Make sure to cut it evenly and place it cut side down while baking to achieve tender strands without overcooking.
Final Thoughts
Chicken Alfredo Spaghetti Squash Casserole is not only delicious but also incredibly versatile. This hearty meal allows you to incorporate various vegetables and adjust flavors according to your taste. Give it a try; you’ll love its comforting texture and ease of preparation!
Chicken Alfredo Spaghetti Squash Casserole: Whole30, Paleo, Low Carb, GF
Chicken Alfredo Spaghetti Squash Casserole is a delightful and healthy twist on the classic comfort food. This Whole30, Paleo, low carb, and gluten-free dish combines tender, juicy chicken with the unique texture of spaghetti squash, all enveloped in a creamy garlic Alfredo sauce. Packed with nutritious broccoli and onions, this casserole is not only satisfying but perfect for meal prep or cozy family dinners. Enjoy this flavorful dish that will leave everyone asking for seconds!
- Prep Time: 15 minutes
- Cook Time: 60 minutes
- Total Time: 1 hour 15 minutes
- Yield: Serves approximately 6 people 1x
- Category: Dinner
- Method: Baking
- Cuisine: American
Ingredients
- 1 lb boneless, skinless chicken breasts
- 1 medium white onion, diced
- 3 cups broccoli florets
- 1 medium spaghetti squash
- 1 jar Primal Kitchen Garlic Alfredo Sauce (or homemade dairy-free Alfredo)
- Olive oil, salt, pepper, garlic powder
Instructions
- Preheat your oven to 400°F.
- Halve the spaghetti squash lengthwise and scoop out seeds. Spray cut sides with oil and place cut side down on a baking sheet.
- In a casserole dish, combine chicken breasts and diced onion. Drizzle with olive oil and season with salt and pepper; toss to coat.
- Bake both dishes in the oven for about 30 minutes.
- Remove from the oven; dice the chicken and scrape spaghetti squash strands into the casserole dish.
- Stir in Alfredo sauce, broccoli florets, additional seasoning if needed; mix well.
- Return to the oven for another 30 minutes until golden brown on top.
- Serve warm and enjoy!
Nutrition
- Serving Size: 1 cup (240g)
- Calories: 320
- Sugar: 4g
- Sodium: 750mg
- Fat: 14g
- Saturated Fat: 3g
- Unsaturated Fat: 9g
- Trans Fat: 0g
- Carbohydrates: 18g
- Fiber: 6g
- Protein: 30g
- Cholesterol: 85mg