Chicken Alfredo Spaghetti Squash Casserole: Whole30, Paleo, Low Carb, GF
This Chicken Alfredo Spaghetti Squash Casserole is a delightful dish that brings together the flavors of creamy alfredo sauce and tender chicken, all nestled in a bed of spaghetti squash. Perfect for meal prep or a cozy weeknight dinner, this recipe is not only Whole30, paleo, low carb, and gluten-free but also packed with vegetables. Enjoy its heartiness and convenience without compromising your dietary goals.
Why You’ll Love This Recipe
- Easy to Prepare: With minimal prep time and straightforward cooking steps, you can whip this up even on busy nights.
- Nutrient-Rich: Packed with broccoli and spaghetti squash, this dish is full of vitamins and minerals.
- Versatile Meal: Ideal for various occasions, whether it’s a family dinner or meal prepping for the week.
- Flavorful: The combination of chicken, alfredo sauce, and spices creates a rich flavor profile that’s sure to satisfy.
- Reheats Well: Storing leftovers is simple; just pop them in the microwave for a quick meal.
Tools and Preparation
Having the right tools on hand will ensure your cooking experience goes smoothly. Here are some essential items you’ll need to make this casserole.
Essential Tools and Equipment
- Casserole dish
- Baking sheet
- Forks
- Knife
- Cutting board
Importance of Each Tool
- Casserole dish: Essential for baking the casserole evenly, allowing all ingredients to meld perfectly.
- Baking sheet: Great for roasting vegetables or cooking spaghetti squash without mess.
- Forks: Perfect for shredding chicken and scraping the spaghetti squash into threads.

Ingredients
For the Chicken and Vegetables
- 1 lb boneless, skinless chicken breasts
- 1 medium white onion, diced
- 3 cups broccoli florets
For the Spaghetti Squash Base
- 1 medium sized spaghetti squash
For the Sauce and Seasoning
- 1 jar Primal Kitchen Garlic Alfredo Sauce (or homemade Whole30/Dairy-Free Alfredo)
- 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)
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.
Step 2: Prepare the Spaghetti Squash
- Cut the spaghetti squash in half lengthwise.
- Scrape out the seeds.
- Spray the cut sides with cooking oil and sprinkle with salt.
- Place cut side down on a baking sheet and put it in 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; sprinkle with salt and pepper.
- Toss to coat everything well before placing it in the oven on a lower rack.
Step 4: Bake Together
Bake both dishes in the oven for 30 minutes. This allows the chicken to cook through while beginning to soften the spaghetti squash.
Step 5: Combine Ingredients
Remove both dishes from the oven.
* Dice cooked chicken breasts and return them to the casserole dish.
* Use a fork to scrape out spaghetti squash threads into the casserole dish (it’s okay if it’s not fully cooked).
Step 6: Add Sauce and Seasonings
Incorporate alfredo sauce, broccoli florets, remaining salt, pepper, and garlic powder into the casserole dish. Stir everything together using two forks until well mixed.
Step 7: Final Bake
Return your casserole to the oven. Bake for an additional 30 minutes or until it becomes slightly golden brown on top.
Step 8: Serve and Enjoy!
Remove from oven, spoon 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 individual preferences. This casserole is not only hearty but also versatile, making it perfect for various occasions. Here are some great serving suggestions to elevate your meal.
Individual Bowls
- Serve the casserole in individual bowls for a cozy, personal touch. Top with fresh herbs like parsley or basil for added flavor and color.
Salad on the Side
- Pair the casserole with a light green salad. A simple mix of arugula, cucumber, and olive oil dressing complements the rich flavors of the dish.
Freshly Grated Nutritional Yeast
- Sprinkle nutritional yeast on top before serving. This adds a cheesy flavor while keeping it dairy-free, aligning perfectly with Whole30 and paleo diets.
Avocado Slices
- Add slices of fresh avocado on top of each serving. The creamy texture of avocado enhances the dish while providing healthy fats.
How to Perfect Chicken Alfredo Spaghetti Squash Casserole: Whole30, Paleo, Low Carb, GF
Achieving the perfect Chicken Alfredo Spaghetti Squash Casserole requires attention to detail and some handy tips. Follow these suggestions to enhance your cooking experience.
- Use Fresh Ingredients: Opt for fresh broccoli and onions for better flavor and texture in your casserole.
- Cook Chicken Thoroughly: Ensure that the chicken is fully cooked before adding it back into the casserole dish to avoid any food safety issues.
- Adjust Seasonings: Feel free to adjust salt, pepper, and garlic powder according to your taste preferences for a more personalized flavor.
- Experiment with Sauces: While Primal Kitchen Garlic Alfredo Sauce is great, consider trying homemade versions for different tastes or dietary needs.
Best Side Dishes for Chicken Alfredo Spaghetti Squash Casserole: Whole30, Paleo, Low Carb, GF
Complementing your Chicken Alfredo Spaghetti Squash Casserole with side dishes can enhance your meal’s overall appeal and nutrition. Here are some excellent options:
-
Roasted Brussels Sprouts
Roasting Brussels sprouts brings out their natural sweetness, making them a delicious side that pairs well with the casserole. -
Garlic Green Beans
Sautéed green beans with garlic add a crunchy texture and vibrant color to your plate. -
Zucchini Noodles
Spiralized zucchini tossed in olive oil provides a low-carb alternative that resembles pasta without the extra carbs. -
Cauliflower Rice
Light and fluffy cauliflower rice acts as a great base under the casserole while keeping it low carb. -
Simple Cucumber Salad
A refreshing cucumber salad dressed lightly offers a cool contrast to the warm casserole. -
Steamed Asparagus
Steamed asparagus drizzled with lemon juice adds brightness and complements the rich flavors of the dish nicely.
Common Mistakes to Avoid
When preparing Chicken Alfredo Spaghetti Squash Casserole, avoid these common pitfalls to ensure a delicious outcome.
- Using Undercooked Chicken: Always ensure chicken is cooked thoroughly before combining it with other ingredients. Use a meat thermometer to check for an internal temperature of 165°F (75°C).
- Ignoring Seasoning: Failing to season the chicken and vegetables can lead to bland flavors. Don’t skip the salt and pepper, and consider adding herbs for extra taste.
- Not Preheating the Oven: Skipping this step can affect cooking time and texture. Preheat your oven to the correct temperature before starting.
- Overcooking the Broccoli: Adding broccoli too early may result in mushiness. Stir it in closer to the end of baking for a tender-crisp texture.
- Forgetting to Scrape the Squash: Make sure you scrape out the spaghetti squash threads well; this creates that signature spaghetti-like texture that makes this dish special.

Storage & Reheating Instructions
Refrigerator Storage
- Store in an airtight container.
- Can be kept in the refrigerator for up to 4 days.
Freezing Chicken Alfredo Spaghetti Squash Casserole: Whole30, Paleo, Low Carb, GF
- Place in a freezer-safe container or wrap tightly with plastic wrap.
- Best if consumed within 2-3 months for optimal freshness.
Reheating Chicken Alfredo Spaghetti Squash Casserole: Whole30, Paleo, Low Carb, GF
- Oven: Preheat your oven to 350°F (175°C) and bake covered for about 20 minutes or until heated through.
- Microwave: Heat in short intervals (1-2 minutes) until warm, stirring occasionally for even heating.
- Stovetop: Use medium heat in a skillet, stirring frequently until warmed through.
Frequently Asked Questions
What makes this Chicken Alfredo Spaghetti Squash Casserole Whole30 compliant?
This casserole uses compliant ingredients like chicken and vegetable-based sauces without added sugars or preservatives.
Can I customize the veggies in Chicken Alfredo Spaghetti Squash Casserole?
Absolutely! Feel free to add your favorite vegetables such as bell peppers or spinach for added nutrition.
Is this dish suitable for meal prep?
Yes! This casserole is perfect for meal prep as it stores well and reheats easily throughout the week.
How do I make a homemade dairy-free alfredo sauce?
You can blend soaked cashews with garlic, nutritional yeast, lemon juice, and vegetable broth for a creamy dairy-free sauce.
Can I use other proteins instead of chicken?
Certainly! You may substitute turkey or even cooked beef if you prefer a different flavor profile.
Final Thoughts
Chicken Alfredo Spaghetti Squash Casserole is not only wholesome but also incredibly versatile. It’s perfect for meal prep or a quick weeknight dinner. Feel free to customize it with your favorite vegetables or proteins for a unique twist!
Chicken Alfredo Spaghetti Squash Casserole
Indulge in the comforting flavors of Chicken Alfredo Spaghetti Squash Casserole, a wholesome dish that seamlessly combines creamy alfredo sauce with tender chicken and nutritious spaghetti squash. This recipe, perfect for meal prep or cozy weeknight dinners, is not only Whole30, paleo, low carb, and gluten-free but also brimming with vibrant vegetables like broccoli.
- Prep Time: 15 minutes
- Cook Time: 60 minutes
- Total Time: 1 hour 15 minutes
- Yield: Serves 4
- Category: Dinner
- Method: Baking
- Cuisine: American
Ingredients
- 1 lb boneless, skinless chicken breasts
- 1 medium white onion, diced
- 3 cups broccoli florets
- 1 medium sized spaghetti squash
- 1 jar Primal Kitchen Garlic Alfredo Sauce
- 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 (200°C).
- Cut the spaghetti squash in half lengthwise and scrape out the seeds. Season the cut sides with olive oil and salt before placing them cut side down on a baking sheet.
- In a casserole dish, combine diced chicken breasts and onion with olive oil, salt, and pepper. Bake both dishes for about 30 minutes.
- After baking, shred the chicken into pieces and scrape the spaghetti squash into threads.
- Mix everything in the casserole dish with broccoli florets and alfredo sauce. Stir well.
- Return to the oven for another 30 minutes until golden brown.
Nutrition
- Serving Size: 1 cup (240g)
- Calories: 350
- Sugar: 3g
- Sodium: 490mg
- Fat: 15g
- Saturated Fat: 2g
- Unsaturated Fat: 10g
- Trans Fat: 0g
- Carbohydrates: 36g
- Fiber: 7g
- Protein: 27g
- Cholesterol: 70mg