Chicken Alfredo Spaghetti Squash Casserole: Whole30, Paleo, Low Carb, GF
This Chicken Alfredo Spaghetti Squash Casserole: Whole30, Paleo, Low Carb, GF is an excellent dish for any occasion. It’s a comforting, hearty meal that brings together tender chicken, fresh vegetables, and a creamy sauce all in one casserole. Perfect for meal prep or a busy weeknight dinner, this recipe offers a healthy twist on classic comfort food while being gluten-free and dairy-free.
Why You’ll Love This Recipe
- Healthy and Nutritious: Packed with protein from chicken and vitamins from broccoli, this casserole supports your dietary goals.
- Meal Prep Friendly: Easily make ahead of time for quick lunches or dinners throughout the week.
- Flavorful and Satisfying: The creamy garlic alfredo sauce ties everything together for a deliciously rich flavor without the guilt.
- Versatile Ingredients: Swap in your favorite veggies or proteins to customize this dish to your taste!
- Easy to Make: With straightforward steps and minimal prep work required, you’ll have dinner ready in no time.
Tools and Preparation
Before you start cooking, gather your tools to make the process smooth. Having everything at hand will save you time and ensure that everything cooks evenly.
Essential Tools and Equipment
- Baking sheet
- Large casserole dish
- Fork
- Knife
- Cutting board
Importance of Each Tool
- Baking sheet: Ideal for roasting spaghetti squash evenly without sticking.
- Casserole dish: Perfect for combining all ingredients and ensuring heat distribution during baking.
- Fork: Useful for scraping spaghetti squash threads and mixing ingredients effectively.

Ingredients
For the Chicken
- 1 lb boneless, skinless chicken breasts
- 1 medium white onion, diced
For the Spaghetti Squash
- 1 medium sized spaghetti squash
For the Sauce and Vegetables
- 1 jar Primal Kitchen Garlic Alfredo Sauce (or homemade Whole30/Dairy-Free Alfredo)
- 3 cups broccoli florets
Seasonings
- 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 ensures that your casserole cooks evenly from the start.
Step 2: Prepare the Spaghetti Squash
- Cut the spaghetti squash in half lengthwise.
- Scrape out the seeds with a spoon.
- Spray the cut sides with a bit of cooking oil and sprinkle with salt.
- Place the squash cut side down onto a baking sheet on an upper rack of the oven.
Step 3: Prepare the Chicken Mixture
- In a large casserole dish, add the chicken breasts and diced onion.
- Drizzle with olive oil and sprinkle with salt and pepper.
- Toss well to coat everything evenly before placing it into the oven on a lower rack.
Step 4: Bake Both Dishes
Bake both dishes in the oven for about 30 minutes. This allows both components to start cooking 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 spaghetti squash “threads” into the casserole dish (it’s okay if it’s not fully cooked yet).
Step 6: Add Sauce and Veggies
Add in the alfredo sauce, broccoli florets, additional salt, pepper, and garlic powder to the casserole dish.
Use two forks to stir everything together until well combined.
Step 7: Final Bake
Place back into the oven and bake for an additional 30 minutes or until slightly golden brown on top.
Step 8: Serve
Remove from oven once done. 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
Serving Chicken Alfredo Spaghetti Squash Casserole is a delightful experience that can be tailored to your preferences. This dish is not only hearty but also versatile, allowing for various serving suggestions that enhance its flavors and presentation.
Individual Bowls
- Serve in individual bowls for a cozy meal. Top with fresh herbs like parsley or basil for an added touch of freshness.
Family Style
- Place the casserole in the center of the table and let everyone serve themselves. This creates a communal atmosphere perfect for family dinners.
Salad Pairing
- Pair with a fresh green salad dressed in olive oil and lemon juice. The crispness of the salad complements the creamy casserole beautifully.
Crusty Bread on the Side
- Serve with gluten-free bread or cauliflower breadsticks. They can be used to scoop up the casserole, adding texture to your meal.
Garnish with Nutritional Yeast
- Sprinkle nutritional yeast on top before serving for a cheesy flavor without dairy. This adds depth to your dish while keeping it paleo-friendly.
How to Perfect Chicken Alfredo Spaghetti Squash Casserole: Whole30, Paleo, Low Carb, GF
Perfecting your Chicken Alfredo Spaghetti Squash Casserole can elevate it from good to great. Here are some tips to ensure your casserole shines every time you make it.
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Choose ripe spaghetti squash – A ripe squash will yield better texture and flavor. Look for one that feels heavy for its size and has a uniform color.
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Season chicken generously – Enhance the flavor by seasoning the chicken well before cooking. Don’t shy away from using salt and pepper liberally.
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Use fresh broccoli – Fresh florets provide a vibrant taste and crunchy texture compared to frozen varieties. You can steam them slightly before adding if you prefer more tenderness.
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Adjust sauce quantity – If you like it creamier, feel free to add more alfredo sauce. Just ensure it aligns with your dietary preferences.
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Bake until golden – Keep an eye on baking time; you want the top to be golden brown for optimal flavor and presentation.
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Let it rest before serving – Allowing the casserole to sit for 5-10 minutes after baking ensures easier serving and better flavor melding.
Best Side Dishes for Chicken Alfredo Spaghetti Squash Casserole: Whole30, Paleo, Low Carb, GF
Pairing side dishes with your Chicken Alfredo Spaghetti Squash Casserole enhances the meal’s overall experience. Here are some excellent options that complement this dish perfectly.
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Garlic Roasted Asparagus – Roasting asparagus with garlic brings out its natural sweetness and adds an aromatic element.
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Sautéed Spinach with Lemon – Quick sautéed spinach seasoned with lemon juice provides a bright contrast to the rich casserole.
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Cauliflower Rice Stir-Fry – A light cauliflower rice stir-fry with vegetables adds bulk without extra carbs, making it a great low-carb option.
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Zucchini Noodles – Lightly sautéed zucchini noodles offer a fun alternative pasta experience alongside your casserole.
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Crispy Brussels Sprouts – Roasted Brussels sprouts give a crunchy texture and nutty flavor that pairs nicely with the creamy casserole.
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Roasted Carrot Medley – A mix of roasted carrots seasoned with herbs brings sweetness and color to your plate.
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Cucumber Tomato Salad – A refreshing cucumber tomato salad drizzled with balsamic vinegar adds acidity that balances richness.
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Avocado Salad – Simple avocado slices seasoned with salt and lime juice create a creamy side that complements any savory dish wonderfully.
Common Mistakes to Avoid
When preparing your Chicken Alfredo Spaghetti Squash Casserole, avoid these common mistakes to ensure a delicious outcome.
- Skipping the seasoning: Always season your chicken and vegetables well. A pinch of salt and pepper can elevate flavors significantly.
- Not cooking the spaghetti squash properly: Ensure you bake the squash until tender. Undercooked squash will be hard to shred and won’t blend well with other ingredients.
- Overcooking the chicken: Keep an eye on the chicken while baking. Overcooked chicken can become dry. Aim for juicy, tender pieces.
- Ignoring ingredient quality: Use high-quality sauces and fresh ingredients. This can make a big difference in taste.
- Forgetting to mix thoroughly: When combining all ingredients, ensure everything is well mixed for even flavor distribution throughout the casserole.

Storage & Reheating Instructions
Refrigerator Storage
- Store leftovers in an airtight container.
- The casserole will last up to 4 days in the refrigerator.
Freezing Chicken Alfredo Spaghetti Squash Casserole: Whole30, Paleo, Low Carb, GF
- Allow the casserole to cool completely before freezing.
- Store in a freezer-safe container or wrap tightly with plastic wrap and foil.
- It can be frozen for up to 2 months.
Reheating Chicken Alfredo Spaghetti Squash Casserole: Whole30, Paleo, Low Carb, GF
- Oven: Preheat to 350°F and bake covered for about 20-25 minutes or until heated through.
- Microwave: Heat individual portions on medium power for 2-3 minutes, stirring halfway through.
- Stovetop: Warm in a skillet over medium heat, stirring occasionally until heated through.
Frequently Asked Questions
What makes Chicken Alfredo Spaghetti Squash Casserole Whole30 approved?
This casserole is made without dairy or grains and uses compliant ingredients that fit within Whole30 guidelines.
Can I customize this Chicken Alfredo Spaghetti Squash Casserole?
Absolutely! You can add other vegetables like bell peppers or zucchini for extra nutrition and flavor.
How do I ensure my casserole is low carb?
By using spaghetti squash instead of traditional pasta, this recipe remains low in carbohydrates while still being filling.
What’s the best way to serve Chicken Alfredo Spaghetti Squash Casserole?
Serve it warm as a hearty main dish. It’s also perfect as meal prep for easy lunches throughout the week!
Final Thoughts
Chicken Alfredo Spaghetti Squash Casserole is not only nutritious but also incredibly versatile. You can tailor it to your taste by adding different veggies or using various sauces. With its rich flavors and satisfying texture, this dish is perfect for any night of the week. Try it out and enjoy a wholesome meal that everyone will love!
Chicken Alfredo Spaghetti Squash Casserole
Indulge in a wholesome meal with our Chicken Alfredo Spaghetti Squash Casserole, a delightful fusion of comfort food and healthy eating. This dish combines tender chicken, vibrant broccoli, and creamy garlic alfredo sauce over spaghetti squash for a satisfying and nutritious dinner option. Perfect for busy weeknights or meal prep, this casserole is gluten-free, dairy-free, and low in carbs, making it suitable for various dietary preferences. Enjoy the rich flavors without the guilt while impressing your family and friends with this easy and customizable recipe.
- Prep Time: 15 minutes
- Cook Time: 60 minutes
- Total Time: 1 hour 15 minutes
- Yield: Serves 6
- Category: Main
- Method: Baking
- Cuisine: American
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)
- 3 cups broccoli florets
- 1/2 tbsp olive oil (or avocado oil)
- 1/2 tsp salt (plus more for seasoning chicken)
- 1/2 tsp garlic powder
- 1/2 tsp pepper (plus more for seasoning chicken)
Instructions
- Preheat the oven to 400°F.
- Prepare the spaghetti squash by halving it lengthwise, removing seeds, seasoning with salt and oil, and placing cut-side down on a baking sheet.
- In a casserole dish, combine diced chicken and onion with olive oil and seasonings. Bake both dishes for about 30 minutes.
- Once cooked, shred the spaghetti squash into threads and combine with diced chicken, alfredo sauce, broccoli florets, and additional seasonings.
- Mix well and return to bake for an additional 30 minutes until golden brown on top.
- Allow to cool slightly before serving.
Nutrition
- Serving Size: 1 cup (250g)
- Calories: 320
- Sugar: 2g
- Sodium: 540mg
- Fat: 14g
- Saturated Fat: 2g
- Unsaturated Fat: 10g
- Trans Fat: 0g
- Carbohydrates: 18g
- Fiber: 4g
- Protein: 30g
- Cholesterol: 80mg