This Pesto Chicken Stuffed Spaghetti Squash is made with only a few simple ingredients and with very little prep time! Spaghetti squash halves are roasted until golden and caramelized, loaded with Italian-seasoned chicken, bright pesto sauce, roasted cherry tomatoes, and tons of melty mozzarella cheese.
Preheat the oven to 425°F and line a large baking sheet with parchment paper.
Cut the spaghetti squash in half lengthwise and scrape out the seeds. Drizzle 1 tablespoon of the olive oil over the cut sides, rubbing it in, and season with 1 teaspoon salt and ½ teaspoon black pepper. Place the halves cut-side down on the prepared baking sheet and bake for 30-40 minutes, or until the edges begin to brown.
1 large spaghetti squash
Toss the cherry tomatoes with 1 tablespoon olive oil, ½ teaspoon salt, and ¼ teaspoon black pepper in a medium bowl. Add them to the baking sheet around the squash and return to the oven for another 15-20 minutes, or until the tomatoes soften and blister slightly and the squash is tender. Remove from the oven and let cool for 10-15 minutes.
1 pint cherry tomatoes
Place the chicken breasts on a cutting board, cover with plastic wrap, and pound to 1 inch thick with a meat mallet. Season both sides with Italian seasoning, 1 teaspoon salt, and ½ teaspoon black pepper.
1 ¼ pounds chicken breasts, 1 tablespoon Italian seasoning
Heat the remaining 2 tablespoons of the olive oil in a large skillet over medium-high heat. Add the chicken in a single layer and cook for 6-7 minutes per side, or until the internal temperature reaches 165°F. Transfer to a plate and let rest for 5 minutes, then cut into bite-sized cubes.
Flip the spaghetti squash halves over and use a fork to scrape and fluff the strands, pulling them from the skin.
Divide the pesto sauce, chicken, roasted tomatoes, and mozzarella between each spaghetti squash half and toss to combine. Place under the broiler for 4-5 minutes, or until the cheese is melted and slightly golden.
8 ounces fresh mozzarella cheese, ½ cup prepared pesto sauce
Serve immediately with fresh basil or parsley, if desired.
Fresh parsley or basil
Video
Notes
Mozzarella Cheese: Fresh mozzarella gives the best melty bite! Cubes of fresh mozzarella work great, but pre-shredded can be used (just know it won’t melt quite the same).
Pesto:Fresh basil pesto, either homemade or store-bought from the deli section, has way more flavor than jarred varieties. Jarred works fine but tends to be oilier and less vibrant.
Italian Seasoning: This recipe was tested using Evolving Table’s Italian seasoning. If using a different brand, you may need to adjust the salt to taste, as blends can vary.
Avoiding Watery Squash: Roasting the squash cut-side down helps excess moisture evaporate. Once baked, let it rest for 5-10 minutes before scraping the strands—this keeps it from getting too soggy!