This Chicken Alfredo Spaghetti Squash is the ultimate comforting, low-carb alternative to traditional pasta. By using the natural, spaghetti-like strands of a roasted squash as a base, you get all the satisfaction of a creamy Italian meal with a boost of fiber and nutrients. The sauce is a clever, lighter version of Alfredo, utilizing Greek yogurt and cream cheese to create a velvety texture that is high in protein and incredibly savory.
Stuffed back into the squash shells and topped with bubbly mozzarella cheese, these “squash boats” are as fun to serve as they are delicious to eat.
Recipe Details
- Flavor Profile: Rich and garlicky with a savory herb blend of basil, oregano, and parsley, finished with a tangy creaminess from the yogurt base.
- Textures: Tender, spaghetti-like squash strands tossed with juicy chicken and wilted spinach in a smooth, clinging sauce with a melted cheese crust.
- Total Time: Approximately 1 hour and 15 minutes.
- Difficulty: Easy – involves simple roasting and a straightforward stovetop sauce.
What You’ll Need
To prepare this dish, you will need a medium-sized spaghetti squash and cooked chicken breast (cubed or shredded). The Alfredo sauce is a unique blend of unsalted butter, chicken stock, cream cheese, and plain Greek yogurt, thickened slightly with a cornstarch slurry. For flavor and nutrition, you’ll add fresh baby spinach and a trio of dried Italian herbs.
Ingredient Notes
- Spaghetti Squash – Look for a squash around 4-5 pounds. The larger the squash, the longer it will need in the oven. It should feel heavy for its size.
- Plain Greek Yogurt – This is a brilliant substitute for heavy cream. It adds a lovely tang and keeps the dish lighter while providing extra protein.
- Cream Cheese – Softening this at room temperature is essential so it melts smoothly into the chicken stock without clumping.
- Freshly Grated Parmesan – Freshly grated cheese melts much better than the pre-shredded kind, which is often coated in starch.
- Cornstarch Slurry – This mixture of cornstarch and water ensures your sauce has the perfect “cling” to the squash strands.
Add-ins and Substitutions
- Protein – While chicken is classic, this recipe also works beautifully with sautéed shrimp or even Italian sausage.
- Vegetables – Feel free to add sautéed mushrooms, diced sun-dried tomatoes, or steamed broccoli florets to the sauce along with the spinach.
- Spice – Add a pinch of crushed red pepper flakes to the garlic if you prefer a little heat in your Alfredo.
- Cheese – If you don’t have mozzarella for the topping, a blend of provolone or fontina also melts beautifully.
How to Make Chicken Alfredo Spaghetti Squash
This recipe is broken down into three stages: roasting the squash, preparing the creamy chicken filling, and the final cheesy bake.
To Cook Spaghetti Squash
- Prep the Squash: Preheat your oven to 400 F. Cut the squash in half lengthwise and scoop out the seeds using a large fork or spoon. Discard the seeds.
- Roast: Brush the entire inside of each half with olive oil. Place the squash flesh-side down on a baking sheet. Bake for 45-55 minutes. Check at the 40-minute mark; the shell should be soft when squeezed lightly.
- Cool: Remove from the oven and allow it to cool for 10-15 minutes until safe to touch. Flip each squash over and lower the oven temperature to 350 F.
Prepare the Chicken Alfredo
- Aromatics: While the squash cools, melt butter in a large skillet over medium heat. Add the minced garlic and cook for 30 seconds until fragrant.
- Whisk the Base: Pour in the chicken stock and the cornstarch/water mixture. Whisk until smooth. Bring to a boil, then reduce heat to low and simmer.
- Creamy Layers: Stir in the softened cream cheese until melted. Add the parmesan cheese and whisk until the sauce is smooth. Stir in the basil, oregano, and parsley.
- Final Touch: Stir in the Greek yogurt until the sauce is smooth and creamy. Season with salt and pepper to taste.
- Fold in Add-ins: Add the cooked chicken to the sauce to warm through. Stir in the roughly chopped spinach and cook just until it has wilted.
Assembly
- Shred: Use a fork to shred the inside of the squash into long strands, pulling it slightly away from the shell.
- Stuff and Bake: Evenly distribute the chicken and sauce between the two squash halves. Top each with 1/2 cup of mozzarella cheese.
- The Melt: Bake for 5-10 minutes until the cheese is melted and starting to brown. For extra “brown bubbles,” broil on high for 1-2 minutes, watching closely!
- Serve: Garnish with extra parsley and enjoy immediately.
Pro Tip: Checking the squash by squeezing the shell is the most reliable way to tell if it’s done. If the shell gives easily under light pressure, the strands inside will be perfectly tender. If it feels rock hard, it needs more time.
Recipe Tips
- Flesh-Side Down – Roasting the squash flesh-side down traps the steam inside, which helps cook the strands quickly and prevents the top from drying out or burning.
- Sauce Consistency – If the sauce seems too thick after adding the yogurt, you can thin it out with a tablespoon or two of extra chicken stock.
- Fresh Herbs – While the recipe calls for dried herbs, you can use fresh basil and parsley if you have them just triple the amount (use 1 tablespoon of fresh for every 1 teaspoon of dried).
- Cooked Chicken – This is a perfect way to use up a leftover rotisserie chicken!
FAQs
How do I prevent the squash from being watery? Roasting it at a high temperature (400 F) helps evaporate excess moisture. Also, ensure you aren’t overcooking it; mushy squash tends to release more water.
Can I make this vegetarian? Absolutely. Simply omit the chicken and use vegetable stock instead of chicken stock. You can add extra vegetables like mushrooms or bell peppers to keep it hearty.
How do I store leftovers? You can scoop the filling out of the shells and store it in an airtight container in the fridge for up to 3 days. Reheat in the microwave or in a skillet over low heat.
Serving Suggestions
- Salad – A bright Italian side salad with a red wine vinaigrette provides a crisp contrast to the rich Alfredo sauce.
- Bread – If you aren’t strictly low-carb, a piece of garlic bread is perfect for dipping into the creamy sauce.
- Wine – A chilled glass of Pinot Grigio or Sauvignon Blanc pairs beautifully with the lemon and garlic notes.
Make This Recipe in Advance
You can roast the spaghetti squash and prepare the Chicken Alfredo sauce up to a day in advance. Store the shredded squash and the sauce in separate containers in the refrigerator. When ready to serve, combine them in the squash shells (or a baking dish), top with mozzarella, and bake at 350 F for about 20 minutes until heated through and bubbly.
Healthy Chicken Alfredo Spaghetti Squash Boats with Greek Yogurt Sauce
- Total Time: 1 hour 15 minutes
- Yield: 2 large servings (4 halves) 1x
Description
The ultimate comforting, low-carb alternative to traditional pasta. Utilizing the natural, spaghetti-like strands of roasted squash and a clever, lighter Alfredo sauce made with Greek yogurt and cream cheese, these ‘squash boats’ are high in protein and nutrients while remaining incredibly creamy and satisfying.
Ingredients
Spaghetti Squash
- 1 medium spaghetti squash (4–5 lbs)
- 1 tbsp olive oil
Lighter Alfredo Sauce
- 1 cup plain Greek yogurt, 1 cup low-sodium chicken stock
- 1/2 cup fresh Parmesan, 1/4 cup softened cream cheese
- 2 tbsp unsalted butter, 1/2 tbsp minced garlic
- 2 tsp cornstarch (mixed with 1 tbsp water)
- 1 tsp each: dried basil, oregano, parsley, plus salt/pepper
Add-ins & Toppings
- 8 oz cooked chicken breast (cubed)
- 2 cups baby spinach, 1 cup shredded mozzarella
Instructions
Roast: Preheat oven to 400°F. Halve squash, remove seeds, brush with oil, and bake flesh-side down for 45–55 mins until soft. Flip over and lower oven to 350°F.
Sauce: Sauté garlic in butter. Whisk in stock and cornstarch slurry; bring to a boil then reduce heat. Stir in cream cheese and Parmesan until smooth. Whisk in herbs and Greek yogurt.
Combine: Fold chicken and spinach into the sauce until spinach wilts. Shred the squash interior with a fork.
Stuff & Bake: Distribute the mixture into the squash halves. Top with mozzarella and bake for 5–10 mins until bubbly (broil for the last 2 mins).
Notes
Flesh-Side Down: Roasting the squash face-down is essential; it traps steam inside to hydrate the strands and prevents the edges from drying out during the long roast.
The Squeeze Test: If the shell gives easily under light pressure (using a mitt!), the strands inside are perfectly tender and ready to be shredded.
Yogurt Science: Use Greek yogurt for maximum thickness. If the sauce becomes too viscous after combining, whisk in a tablespoon of extra broth to achieve your preferred creamy consistency.
- Prep Time: 15 minutes
- Cook Time: 1 hour
- Category: Main Course
- Method: Roasting / Stovetop Sauce
- Cuisine: Italian-American Fusion
Nutrition
- Serving Size: 1/2 squash boat
- Calories: 445
- Sugar: 8
- Sodium: 620
- Fat: 26
- Saturated Fat: 15
- Unsaturated Fat: 11
- Trans Fat: 0
- Carbohydrates: 18
- Fiber: 4
- Protein: 38
- Cholesterol: 110
Keywords: chicken alfredo spaghetti squash, low carb alfredo, spaghetti squash boats, healthy italian dinner, greek yogurt alfredo sauce
