If you are craving a dish that is bursting with flavor, packed with wholesome ingredients, and makes you feel like you’re dining at a cozy Italian trattoria, this Cheesy Pesto Chicken Spaghetti Squash Recipe will absolutely steal your heart. The tender, stringy texture of roasted spaghetti squash perfectly mimics pasta but keeps it light and nourishing, while the vibrant pesto blended with creamy Greek yogurt and melty mozzarella adds layers of irresistible richness. It’s comfort food elevated with a healthful twist, making it a go-to for weeknight dinners or serving friends with flair and ease.

Ingredients You’ll Need

The image shows seven white bowls and a white plate on a white marbled surface. The largest bowl in the center is filled with yellow and light cream shredded spaghetti squash, showing a mix of soft and stringy textures. To the right, a white plate holds two light tan cooked chicken pieces with some brown pepper seasoning. Surrounding the main bowl are smaller white bowls: one contains a green rough-textured pesto sauce, another has white shredded cheese, the next is filled with fine white grated cheese, one holds thick white sour cream, and another contains mixed dry seasonings including red flakes, green herbs, and light brown powder. A few green parsley leaves lie on the marbled surface near the bowls. photo taken with an iphone --ar 4:5 --v 7

Gathering simple, fresh ingredients is the key to making this Cheesy Pesto Chicken Spaghetti Squash Recipe a standout. Each component plays an important role: from the roasted squash that forms the base, to the pesto and cheeses that bring creamy decadence, and the spices that provide a subtle kick.

Spaghetti squash: This naturally stringy vegetable creates the perfect gluten-free “noodle” base.

Shredded cooked chicken breasts: Adds lean protein and a satisfying meaty texture.
Pesto: Infuses fresh herb flavor and a luscious, garlicky punch.
Plain low fat Greek yogurt: Creamy and tangy, it lightens the sauce without sacrificing richness.

Dried oregano: Brings an aromatic warmth that enhances the Italian-inspired profile.
Red pepper flakes: Offers just the right amount of gentle heat to balance the creaminess.
Garlic powder: Intensifies the savory notes subtly throughout the dish.

Kosher salt and fresh ground black pepper: Essential for seasoning and bringing all flavors together.
Part skim mozzarella cheese: Melts beautifully to create that irresistible cheesy topping.
Parmesan cheese: Adds a sharp, nutty finish that complements the pesto perfectly.

Flat leaf parsley and extra pesto: Fresh garnishes that brighten and elevate the presentation.

How to Make Cheesy Pesto Chicken Spaghetti Squash Recipe

Step 1: Roast the Spaghetti Squash

Start by preheating your oven to 400° F. Cut your spaghetti squash in half lengthwise and scoop out the seeds. Place the halves cut side down on a baking sheet lined with parchment paper, then roast them until tender—usually around 40 minutes. Once cooled enough to handle, use a fork to scrape the flesh into delightful spaghetti-like strands. This process concentrates the squash’s natural sweetness and creates the perfect texture to carry all those delicious flavors that will come next.

Step 2: Combine the Sauce and Chicken

In a large bowl, mix the pesto, Greek yogurt, half of the mozzarella and Parmesan, along with dried oregano, garlic powder, red pepper flakes, kosher salt, and black pepper. Stir these ingredients until they form a creamy, herby sauce. Then add the shredded cooked chicken and the spaghetti squash strands, folding everything together gently to make sure every strand is coated with that luscious, cheesy pesto blend. This step is where the magic happens, marrying every ingredient into a tangy, savory harmony.

Step 3: Bake to Melty Perfection

Transfer the mixture into a baking dish that you have lightly sprayed with non-stick cooking spray. Sprinkle the remaining mozzarella and Parmesan on top, which will melt into a satisfyingly golden, bubbly cheese layer. Bake in a 375° F oven for about 20 minutes, or until the cheese on top is melted and the whole dish is warmed through. When it comes out, you’ll have a gorgeous casserole that’s creamy and cheesy with just the right hint of spice and herbal brightness.

How to Serve Cheesy Pesto Chicken Spaghetti Squash Recipe

The dish is served in a deep white bowl with a brown rim on a white marbled surface. It has three main layers: the bottom layer is shredded pale yellow spaghetti squash, soft and stringy; the middle layer consists of small pieces of light-colored cooked chicken mixed evenly throughout; the top layer is melted white cheese scattered with small dollops of green pesto and sprinkled with fresh chopped green herbs. A metal fork is resting partially inside the bowl, holding some of the spaghetti squash and chicken. Photo taken with an iphone --ar 4:5 --v 7

Garnishes

A sprinkle of freshly chopped flat leaf parsley adds a refreshing pop of color and subtle herbal crispness that balances the creamy richness. Drizzle a little extra pesto on top for an eye-catching glossy finish and to amplify the bright basil flavors that make this dish so distinctive.

Side Dishes

For a complete meal, complement this cheesy pesto chicken spaghetti squash with a simple arugula salad dressed with lemon vinaigrette to add a peppery, tangy contrast. Roasted cherry tomatoes or lightly steamed broccoli are excellent veggie sides that bring vibrant color and subtle sweetness, rounding out the meal perfectly.

Creative Ways to Present

Serve this recipe right from the baking dish for a rustic, family-style vibe or portion it into individual ramekins for a more elegant presentation. You can even scoop servings back into reserved squash shells for an impressive and playful touch that’s perfect for entertaining guests.

Make Ahead and Storage

Storing Leftovers

Keep any leftover cheesy pesto chicken spaghetti squash in an airtight container in the refrigerator for up to 4 days. The flavors actually deepen after resting, making these leftovers taste just as delicious the next day.

Freezing

This dish freezes well too! Transfer cooled portions into freezer-safe containers and freeze for up to 3 months. Be sure to thaw overnight in the refrigerator before reheating to preserve its texture and flavors.

Reheating

Reheat leftovers in the oven at 350° F until warmed through to maintain the melty cheese topping. Alternatively, microwave on medium power in short intervals, stirring halfway to ensure even heating without drying out the chicken or squash.

FAQs

Can I use store-bought cooked chicken?

Absolutely! Using rotisserie or pre-cooked chicken is a fantastic time-saver and works perfectly in this recipe. Just shred it evenly before mixing.

Is this recipe gluten-free?

Yes, this whole dish is naturally gluten-free since spaghetti squash replaces traditional pasta. Just double-check your pesto and other ingredients to ensure they’re gluten-free as well.

What can I substitute for Greek yogurt?

If you don’t have Greek yogurt, sour cream or a creamy cashew sauce can work as alternatives. They provide similar creaminess though the flavor profile might be a little different.

Can I make this vegetarian?

Sure! Simply omit the chicken and consider adding sautéed mushrooms or sun-dried tomatoes for extra savory depth.

How spicy is this dish?

The red pepper flakes add just a gentle warmth that enhances the flavors without overwhelming. You can adjust the amount to your heat preference or skip it altogether if you prefer mild dishes.

Final Thoughts

This Cheesy Pesto Chicken Spaghetti Squash Recipe is one of those warm, comforting meals that never fails to impress and satisfy. It combines healthy ingredients with cheesy, herbaceous goodness in a way that feels indulgent without the guilt. I cannot recommend it enough—grab your ingredients, get roasting that spaghetti squash, and enjoy every luscious bite with your favorite people!

Cheesy Pesto Chicken Spaghetti Squash Recipe

Ingredients You’ll Need