Creamy Pesto Stuffed Spaghetti Squash

I love a recipe that feels fancy but is actually low-effort, and this creamy pesto stuffed spaghetti squash does exactly that — bright basil pesto, silky creaminess, and those stringy squash noodles that soak up every bit of flavor. It’s cozy, a little veggie-forward, and somehow feels like comfort food without the heavy guilt.

My husband calls this “that green noodle thing” and asks for it on repeat, which I take as the highest form of flattery. Our kid licks the pesto off their fork and then pretends not to like vegetables — classic. It turned into a Sunday staple after I accidentally doubled the pesto one week (no regrets) and we discovered it freezes fine for emergency weeknight dinners.

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I once tried to “quick-roast” a spaghetti squash by stabbing it with holes and microwaving it for five minutes before baking — it sort of worked but turned the whole oven into a steam cloud. Now I halve it, scoop, hit it with olive oil and salt, and roast until the edges caramelize a touch. Also, if your pesto is store-bought and a little flat, stir in a squeeze of lemon and a pinch of salt — instant life. If you’re making pesto from scratch and your blender gets clingy, stop, scrape down, add a spoon of oil, and go again. This recipe is forgiving; treat it like a loose guideline not a sacred text.

Shopping Tips

– Vegetables: Pick a medium spaghetti squash with firm skin and no soft spots; heavier is usually riper.
– Cheese: Use good Parmesan or Pecorino — a little goes a long way and it adds that nutty saltiness.
– Dairy: Opt for half-and-half or light cream for richness without being too heavy; plain Greek yogurt can lighten it up.
– Fresh Herbs: Fresh basil makes a huge difference in pesto flavor; avoid wilted bunches.
– Nuts & Seeds: Pine nuts are classic in pesto but toasted walnuts or almonds save money and still taste great.

Prep Ahead Ideas

– Roast the spaghetti squash a day ahead, scrape the strands into a container, and refrigerate; reheat and finish with pesto when you’re ready.
– Make pesto a few days in advance — it keeps well with a thin film of olive oil on top.
– Grate cheese and toast nuts beforehand in small airtight containers so dinner comes together in minutes.
– Use shallow airtight containers for quick reheating; glass works best if you want to go from fridge to oven.

✔Time-Saving Tricks

– Microwave the whole squash for 2–4 minutes first to shorten roast time, then finish in the oven for texture.
– Use store-bought pesto when life is loud — upgrade it with lemon and a handful of fresh basil.
– Toss everything in a skillet and warm through instead of baking if you want dinner in 10 minutes.
– Roast extra squash halves on sheet pan to cook multiple at once for meal prep.

✔Common Mistakes

– Overcooking: squash can go mushy if left too long; watch for golden edges, not mush.
– Watery sauce: if pesto is too oily or squash too watery, drain some liquid off or simmer the mixture briefly to concentrate.
– Under-seasoning: pesto and squash both need salt; taste before serving.
– I once forgot the nut garnish and felt like something was missing — the crunch is worth the few extra minutes to toast them.

What to Serve It With

– A peppery arugula salad dressed with lemon and olive oil.
– Crusty bread or garlic toast for sopping up sauces.
– Roasted chicken thighs or pan-seared salmon if you want protein.
– Steamed green beans or a simple tomato salad for extra brightness.

✔Tips & Mistakes

– Salt the strands while they’re hot so the seasoning sticks.
– Don’t drown the squash in sauce — start with less and add more as needed.
– If the squash is too stringy, a quick toss in a hot skillet tightens things up.
– Be gentle when scraping so you keep long, pretty strands instead of sad mush.

✔Storage Tips

Store leftovers in an airtight container in the fridge for up to 4 days. The texture changes a little but it reheats beautifully in a skillet or microwave. Cold leftovers are fine for lunch — I eat them straight from the fridge with extra lemon. No shame eating this for breakfast; pesto + leftover squash + a fried egg is a revelation.

✔Variations and Substitutions

– Swap any nut in your pantry for pine nuts in pesto — walnuts or almonds work great toasted.
– Use store-bought pesto in a pinch; boost it with lemon, extra parmesan, or a spoon of cream.
– Add cooked chicken, canned white beans, or shrimp to make it a fuller meal.
– For a vegan version, use coconut cream or cashew cream and nutritional yeast instead of cheese.

Frequently Asked Questions

Creamy Pesto Stuffed Spaghetti Squash

Roasted spaghetti squash boats stuffed with a silky pesto cream, melty mozzarella, and fresh basil crunch. A cozy, herb-forward dinner that feels indulgent yet light.

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Prep Time: 15 minutes minutes

Cook Time: 45 minutes minutes

Total Time: 1 hour hour

Servings: 4

Ingredients

 

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Main Ingredients

• ▢ 3 lb spaghetti squash about 1 medium
• ▢ 2 tbsp olive oil
• ▢ 1 tsp kosher salt plus more to taste
• ▢ 0.5 tsp black pepper
• ▢ 2 tsp minced garlic
• ▢ 0.5 cup basil pesto prepared
• ▢ 0.5 cup heavy cream or half-and-half
• ▢ 0.75 cup grated Parmesan
• ▢ 2 cup chopped baby spinach loosely packed
• ▢ 1 tbsp lemon juice freshly squeezed
• ▢ 0.25 tsp crushed red pepper flakes optional heat
• ▢ 1 cup shredded mozzarella
• ▢ 2 tbsp toasted pine nuts for topping, optional
• ▢ 0.25 cup chopped fresh basil for garnish

Instructions

Preparation Steps

• Preheat oven to 425°F. Line a rimmed sheet pan with parchment.
• Halve the squash lengthwise and scrape out seeds with a spoon.
• Rub cut sides with olive oil, then season with salt and pepper.
• Place squash cut-side down on the pan. Prick shells a few times with a fork.
• Roast until the flesh is tender and strands pull easily, 35–45 minutes.
• While it roasts, whisk pesto, cream, Parmesan, lemon juice, garlic, and red pepper in a bowl. Fold in spinach.
• Flip squash cut-side up and cool 5 minutes. Use a fork to rake strands into a large bowl, leaving shells intact.
• Toss hot squash strands with the creamy pesto until evenly coated. Adjust salt and pepper to taste.
• Pack the mixture back into the squash shells. Top with shredded mozzarella.
• Return to oven and broil or bake until cheese is melted and browned in spots, 2–4 minutes.
• Finish with pine nuts and fresh basil. Serve hot.

Notes

Swap the mozzarella for provolone or fontina, or stir in cooked chicken for extra protein. Leftovers keep well; refrigerate in an airtight container for up to 3 days and reheat at 350°F until warm.

This recipe is an original creation inspired by classic Creamy Pesto Stuffed Spaghetti Squash flavors. All ingredient ratios and instructions are independently developed.