If you’re craving a dish that feels both indulgent and wholesome, yet is surprisingly easy to make, this Pesto Chicken Stuffed Spaghetti Squash Recipe is here to become your new favorite. Imagine tender roasted spaghetti squash strands carrying vibrant pesto, juicy chicken cubes, blistered cherry tomatoes, and gooey mozzarella—all baked until bubbly and golden. It’s a colorful, comforting delight that manages to be both nutrient-packed and incredibly satisfying, perfect for a cozy family dinner or impressing friends without the fuss.

Ingredients You'll Need

The image shows a clean white marbled surface with several ingredients neatly arranged. In the top left corner, there is a clear plastic package holding two pieces of light pink chicken. To the right of the chicken is a whole yellow spaghetti squash with a smooth skin. Below them, small round wooden bowls contain black pepper and white salt. A small glass jar labeled Italian Seasoning holds light green dried herbs, while a clear glass bowl holds fresh green pesto with a textured surface. To the bottom left, there is a small white bowl with golden oil. Next to it, a clear glass bowl contains two smooth white mozzarella cheese balls. Finally, on the bottom right, there is a clear plastic container filled with shiny red grape tomatoes. Everything is placed visibly and spaced evenly. Photo taken with an iphone --ar 4:5 --v 7

Every ingredient in this recipe plays a vital role, from adding texture and freshness to contributing rich flavors that make this meal unforgettable. Plus, they’re easy to find, making it approachable for cooks of all levels.

1 large spaghetti squash (about 3 to 4 pounds): The perfect low-carb base, its strands mimic pasta beautifully once roasted.

4 tablespoons olive oil (divided): Adds richness and helps everything roast to golden perfection.
2 ½ teaspoons salt (divided): Enhances and balances all the flavors.
1 ¼ teaspoons black pepper (divided): Brings subtle heat and depth.

1 ¼ pounds chicken breasts: Lean protein that pairs perfectly with pesto’s herbaceous notes.
1 tablespoon Italian seasoning: Infuses the chicken with classic Mediterranean flavors.
1 pint cherry tomatoes: Burst of sweetness and juiciness that complements the savory elements.

½ cup prepared pesto sauce (divided): The bright herbaceous heart of this recipe, providing aromatic punch.
8 ounces fresh mozzarella cheese (shredded or cubed): Melts beautifully to lend creaminess and mild gooey goodness.
Fresh parsley or basil (chopped, optional): A fresh garnish that lifts and brightens every bite.

How to Make Pesto Chicken Stuffed Spaghetti Squash Recipe

Step 1: Preheat and Prepare

Start off by heating your oven to 425°F. Lining a large baking sheet with parchment paper sets you up for an easy cleanup and prevents sticking during roasting—simple steps that make cooking more enjoyable.

Step 2: Cut and Roast the Spaghetti Squash

Cut your spaghetti squash in half lengthwise and scoop out the seeds. Drizzle a tablespoon of olive oil on the cut sides, rubbing it in to help with roasting, then season with salt and pepper. Place the halves cut-side down on your baking sheet and roast for 30 to 40 minutes until the edges begin to brown—this caramelization adds wonderful depth to the squash strands.

Step 3: Roast Cherry Tomatoes

While the squash is roasting, toss the cherry tomatoes with olive oil, salt, and pepper. When the squash is almost done, arrange the tomatoes around it and return to the oven for 15 to 20 minutes. Look for their skins to blister slightly—this invites an intense, concentrated sweetness that complements the savory chicken perfectly.

Step 4: Pound and Season Chicken

While everything roasts, place your chicken breasts on a cutting board, cover with plastic wrap, and gently pound to an even 1-inch thickness. This ensures the chicken cooks evenly and stays juicy. Season both sides with Italian seasoning, salt, and pepper to build layers of Mediterranean flavor.

Step 5: Cook the Chicken

Heat the remaining olive oil in a skillet over medium-high heat and cook your chicken breasts for 6 to 7 minutes per side. You’re aiming for an internal temperature of 165°F, which guarantees tenderness and safety. After resting for 5 minutes to keep juices locked in, cut into bite-sized cubes that will blend beautifully into your spaghetti squash.

Step 6: Fluff the Spaghetti Squash

Once the squash is cool enough to handle, flip it cut-side up and take a fork to scrape out the flesh, pulling it into delicate strands. This step is satisfying and transforms the squash into a pasta-like base ready to carry your filling.

Step 7: Assemble and Broil

Now for the fun part—mix half the pesto sauce, chicken cubes, roasted tomatoes, and mozzarella into each spaghetti squash half. Toss to combine so every bite is flavorful. Place under the broiler for 4 to 5 minutes until the cheese melts and turns mouthwateringly golden. This final step creates an irresistible bubbly topping.

Step 8: Serve with Fresh Herbs

Serve immediately, garnished with chopped parsley or basil if you like, which adds a fresh, vibrant note to balance the creamy pesto and roasted ingredients.

How to Serve Pesto Chicken Stuffed Spaghetti Squash Recipe

The dish shows two halves of a yellow spaghetti squash used as a base, with a smooth and slightly roasted texture forming the shell. Inside, there is a layer of melted white cheese that looks bubbly and slightly browned in spots. On top of the cheese, bright red roasted cherry tomatoes are evenly spread, adding a glossy and juicy texture. There are dollops of green pesto sauce scattered across the surface, adding a coarse and rich green layer. Fresh basil leaves are placed on top, introducing a fresh and vibrant green color, contrasting with the reds and whites. The dish sits on a sheet of brown parchment paper, against a white marbled background. Photo taken with an iphone --ar 4:5 --v 7

Garnishes

A sprinkle of fresh basil or parsley isn’t just for looks; these herbs bring bright, fresh herbal aromas that make every forkful more exciting. A drizzle of extra pesto or a squeeze of lemon can also make the flavors pop.

Side Dishes

Pair this stuffed spaghetti squash with a crisp green salad dressed in lemon vinaigrette or roasted seasonal vegetables for a well-rounded meal. Garlic bread or crusty focaccia can be perfect if you want to add a comforting carb on the side.

Creative Ways to Present

Serve the stuffed squash halves straight on the baking tray for rustic charm or transfer to a colorful platter. For a super elegant touch, remove the spaghetti squash strands and plate them as nests, then top with the chicken and cheese mixture. Either way, it’s sure to impress!

Make Ahead and Storage

Storing Leftovers

Leftovers store beautifully in an airtight container in the refrigerator for up to 3 days. The flavors deepen as they meld, making the next-day meal equally delicious.

Freezing

You can freeze the leftover stuffed squash for up to 2 months. Wrap tightly in plastic wrap and foil or use freezer-safe containers to prevent freezer burn. When ready to eat, thaw overnight in the fridge.

Reheating

Reheat gently in the oven at 350°F, covered with foil to prevent drying out, until warmed through. A quick broil at the end will revive that bubbly melted cheese texture beautifully.

FAQs

Can I use store-bought pesto for this recipe?

Absolutely! Prepared pesto works perfectly and keeps this recipe quick and easy. Just be sure to use a high-quality pesto for the best flavor.

What if I don’t have fresh mozzarella? Can I substitute?

You can use shredded mozzarella or even a mild cheese like provolone. Fresh mozzarella gives the best melt and creaminess, but other cheeses will still taste great.

Is spaghetti squash difficult to cook?

Not at all! Roasting it until fork-tender makes it simple to scrape out strands that resemble pasta. The roasting process brings out its nutty, slightly sweet flavor.

Can I prepare this recipe gluten-free?

Yes! This dish is naturally gluten-free as it uses spaghetti squash instead of pasta. Just double-check your pesto ingredients if you’re concerned about any hidden gluten.

How do I know when the chicken is cooked perfectly?

The best way is to use a meat thermometer to check for an internal temperature of 165°F. This ensures the chicken is safe to eat and remains juicy and tender.

Final Thoughts

This Pesto Chicken Stuffed Spaghetti Squash Recipe is a wonderful way to enjoy a nourishing and flavorful meal that feels special without requiring hours in the kitchen. It’s a dish that offers comforting warmth, vibrant flavors, and just the right touch of elegance. I can’t wait for you to make this for your next dinner—it’s bound to become a beloved favorite in your rotation, just like it is in mine!

Pesto Chicken Stuffed Spaghetti Squash Recipe

Ingredients You'll Need