Pesto Spaghetti Squash

Light, bright, and impossibly satisfying, this Pesto Spaghetti Squash is a simple weeknight winner that feels a little special. It’s a lovely riff on classic pasta with none of the heavy carb load, and it showcases a single roasted spaghetti squash transformed into tender, noodle-like strands tossed with vibrant basil pesto and salty Parmesan. The whole recipe comes together quickly, requires just a handful of pantry staples, and makes a comforting main or a side that pairs beautifully with roasted vegetables or a crisp green salad.

This recipe uses 1 large spaghetti squash, plus a few pantry staples you likely already have. The technique is straightforward: roast the squash until the flesh easily separates into spaghetti-like strands, then toss those strands with olive oil, an aromatic herb blend, basil pesto, and freshly grated Parmesan. Finish with salt and freshly ground black pepper to taste and you have a dish that’s earthy, herbaceous, and deeply comforting.

Why this version works

Spaghetti squash is naturally mild and slightly sweet, so it benefits from bold seasoning and a hit of umami. The olive oil and Italian herb blend infuse the squash as it roasts. Once the strands are loosened, basil pesto adds bright herbal notes and a silky texture that clings to every strand. Generous Parmesan adds savory depth and a salty finish that elevates the whole dish.

Ingredients

• 1 large spaghetti squash (see notes)
• 2 T olive oil
• 2 tsp. Italian Herb Blend (or use other seasoning of your choice)
• 3 T basil pesto (more or less to taste)
• 1 1/4 cups coarsely grated Parmesan cheese
• salt and fresh ground black pepper to taste

Notes on ingredients

Choose a firm, heavy-for-its-size spaghetti squash with smooth skin. If you prefer a nuttier pesto, use one made with extra virgin olive oil and toasty pine nuts or swap in walnuts. The Parmesan should be freshly grated for the best texture and flavor; pre-grated cheese often contains additives that change the melting and mouthfeel. The Italian herb blend can be any mixture you like—dried oregano, basil, thyme, and rosemary work well. If you don’t have a blend on hand, substitute individual dried herbs in equal parts to reach the 2 teaspoons total.

Equipment

• Baking sheet
• Sharp chef’s knife
• Spoon for scooping seeds
• Fork for shredding squash into strands
• Large bowl or the same baking dish for tossing
• Microplane or box grater for Parmesan

Prep and timing

Total time: about 60–75 minutes, mostly hands-off.

Active time: 15–20 minutes. Roasting time varies with squash size; for a large spaghetti squash plan on 45–55 minutes in a preheated oven. The squash is done when a fork easily punctures the skin and the flesh separates into strands when scraped with a fork.

Step-by-step directions

The original directions were short, so I’ve rewritten them into clear, easy steps while preserving the order and the ingredient amounts. Follow these steps exactly for the best results:

1. Preheat your oven to 400°F (200°C). Position a rack in the center of the oven so the squash will roast evenly.
2. Prepare the spaghetti squash: wash the outside and pat it dry. Using a sharp chef’s knife, cut the 1 large spaghetti squash in half lengthwise. Be careful and take your time—a firm squash needs a confident, stable cut.
3. Scoop out the seeds and stringy interior membranes from each half with a spoon. If you like, reserve the seeds to roast later for a crunchy snack.
4. Brush the cut surfaces with 2 tablespoons olive oil, spreading the oil evenly. Sprinkle the cut sides with 2 teaspoons Italian Herb Blend, distributing the seasoning evenly across the flesh. Add a light pinch of salt and a few grinds of fresh black pepper over each half to season the squash before roasting.
5. Place the squash halves cut-side down on a baking sheet lined with parchment paper or a lightly oiled surface. Roasting cut-side down helps steam the squash interior and prevents excessive browning while keeping the flesh tender.
6. Roast in the preheated oven for 45–55 minutes, or until the skin is easily pierced with a fork and the flesh pulls away into strands with a fork. The exact time depends on the size of your squash; test for doneness starting at 45 minutes.
7. Remove the squash from the oven and let it rest for 5 minutes so it’s easier to handle. Turn the halves cut-side up and run a fork lengthwise along the flesh to gently separate it into spaghetti-like strands. Continue until both halves are fully shredded into strands.
8. Transfer the strands to a large bowl or leave them in the baking sheet if it’s roomy and ovenproof. Drizzle the strands with any remaining olive oil from the baking sheet if desired, and add 3 tablespoons basil pesto. Toss gently but thoroughly so the pesto coats the strands evenly. Taste and add a little more pesto if you want a bolder flavor.
9. Sprinkle 1 1/4 cups coarsely grated Parmesan cheese over the tossed strands. Mix again so the cheese incorporates and melts slightly into the warm squash. Season with salt and fresh ground black pepper to taste. Start conservatively with salt; Parmesan is already salty and may be enough on its own.
10. Serve immediately while warm. This dish is lovely on its own as a main, or alongside roasted vegetables, a green salad, or a protein of your choice. Leftovers keep well in the refrigerator for 3–4 days and can be gently reheated in a skillet over low heat until warmed through.

Serving suggestions and variations

Here are a few ways to adapt this base recipe to suit your mood or what’s in your pantry:

• Add roasted cherry tomatoes and a drizzle of balsamic reduction for bright, sweet contrast.
• Stir in a handful of baby spinach or arugula right at the end so the greens wilt into the warm strands.
• For extra protein, serve with pan-seared tofu or a simple grilled chicken breast.
• Swap some of the Parmesan for Pecorino Romano for a sharper finish if you like a bolder cheese flavor.
• For a nuttier pesto flavor, use a pesto made with walnuts, almonds, or a mix of seeds instead of traditional pine nuts.

Tips for success

• Choose a uniform squash for even cooking. If one end is much larger than the other, consider trimming so both halves roast similarly.
• Don’t over-season before tasting; Parmesan adds saltiness. Add salt at the end if necessary.
• Roast cut-side down for moist, tender strands. If you prefer a bit of caramelization, roast cut-side up for the final 10 minutes.
• If the squash is especially large and the oven space is tight, you can halve it crosswise after removing seeds; this increases the surface area and can speed roasting slightly, but keep an eye on timing.

Make-ahead and storage

Spaghetti squash keeps well. Store cooled leftovers in an airtight container in the refrigerator for up to 4 days. Reheat gently in a skillet over medium-low heat, stirring frequently, until warmed through. If the squash seems dry after refrigeration, add a splash of olive oil or a teaspoon of water while reheating to restore moisture.

Nutritional notes

Spaghetti squash is a nutrient-dense vegetable that’s lower in calories and carbohydrates than traditional pasta. The olive oil provides healthy fats, and the Parmesan contributes protein and calcium. Using a moderate amount of pesto keeps the flavor vibrant while maintaining balance.

Final thoughts

This Pesto Spaghetti Squash is ridiculously easy, wildly satisfying, and versatile enough to fit into weeknight dinners or weekend meal prep. It’s a simple way to enjoy bright basil flavor and cheesy comfort without turning on a heavy pot of pasta. Whether you serve it as the centerpiece of a light meal or alongside a more elaborate spread, it’s one of those recipes that looks as good as it tastes—and it’s always worth the roast time.

Enjoy this comforting, herb-forward dish straight from the oven. It’s an excellent showcase for seasonal basil pesto and a delicious way to make the most of a single large spaghetti squash.