Golden Parmesan Spaghetti Squash & Tomato Bake

There is something deeply comforting about a bubbling casserole coming out of the oven — especially when it’s loaded with juicy tomatoes, fragrant herbs, and a golden blanket of Parmesan. This spaghetti squash and tomato bake takes all those cozy flavors and tucks them into a lighter, veggie-packed package that works as a meatless main or a hearty side.

Spaghetti squash is one of my favorite kitchen tricks. Once cooked, its flesh shreds into tender, pasta-like strands that soak up the tomato juices and garlicky herbs beautifully. Mixed with canned chopped tomatoes, fresh basil and oregano, and plenty of Parmesan, it bakes into a dish that’s satisfying without feeling heavy — the kind of dinner that makes eating your vegetables genuinely enjoyable.

The microwave does the heavy lifting of softening the squash, so there’s no wrestling a rock-hard squash with a chef’s knife. One baking dish, everyday ingredients, and eight generous servings — this is weeknight comfort food at its smartest.

Why You’ll Love This Recipe

A meatless main that actually satisfies. The spaghetti squash strands create a filling, pasta-like base, and the tomatoes and Parmesan bring big, bold flavor. Nobody misses the meat here.

Feeds a crowd. One casserole makes eight servings — perfect for family dinner with enough left over for tomorrow’s lunch.

Everyday ingredients. Canned tomatoes, garlic, fresh herbs, and Parmesan are the whole story. No specialty shopping trip required.

One baking dish. After a quick microwave session for the squash, everything mixes and bakes in a single 9×13-inch dish. Minimal fuss, minimal cleanup.

Ingredients

Short, simple, and probably already in your kitchen:

• 1 medium spaghetti squash
• 2 cans (14.5 ounces each) chopped tomatoes, drained
• 1 cup grated Parmesan cheese, divided
• 1/4 cup fresh oregano, chopped
• 1/4 cup fresh basil, chopped
• 2 cloves garlic, chopped
• 1/2 teaspoon salt

How to Make Spaghetti Squash and Tomato Bake

1. Preheat the oven to 400°F. Coat a 9×13-inch baking dish with cooking spray.
2. Pierce the whole spaghetti squash in several places with a sharp knife so steam can escape.
3. Microwave the squash on medium-high for 10 to 15 minutes, turning it every 5 minutes, until the skin gives slightly when pressed and the squash feels tender.
4. Carefully remove the squash from the microwave and let it cool for 5 to 10 minutes, until it’s safe to handle.
5. Cut the squash in half lengthwise. Scoop out and discard the seeds, then use a fork to scrape the flesh into spaghetti-like strands.
6. Transfer the squash strands to the prepared baking dish. Add the drained chopped tomatoes, 3/4 cup of the Parmesan, the oregano, basil, garlic, and salt. Mix until everything is evenly distributed.
7. Sprinkle the remaining 1/4 cup Parmesan evenly over the top.
8. Bake for 45 to 60 minutes, until the casserole is bubbling around the edges and the cheese on top is melted and golden. Let it rest a few minutes before serving.

Tips and Variations

Drain the tomatoes well. Excess liquid is the enemy of a good bake. A quick drain keeps the casserole from turning watery and helps the top get beautifully golden.

Let the squash cool before cutting. It’s tempting to rush, but a hot squash is hard to handle safely. Those 5 to 10 minutes of cooling make the halving and scraping much easier.

Scrape with the grain. Run your fork across the short side of each half to get the longest, most pasta-like strands.

Swap the herbs. Dried oregano and dried basil work fine if fresh isn’t available — use about 1 tablespoon of each. Fresh parsley stirred in at the end adds lovely color too.

Add some protein. Stir in a can of drained white beans or top individual servings with grilled chicken to turn this side into an even heartier main.

Try a different cheese. Pecorino Romano makes a delicious stand-in for Parmesan with a slightly saltier bite — just ease back on the added salt.

Frequently Asked Questions

Can I roast the squash instead of microwaving it?
Yes. Halve and seed the raw squash, brush with a little olive oil, and roast cut-side down at 400°F for 35 to 45 minutes until tender. Then scrape, mix, and bake as directed. It takes longer but works beautifully.

Is this dish gluten-free?
It is naturally gluten-free as written, since spaghetti squash stands in for pasta. Just double-check your canned tomato labels if you’re cooking for someone with celiac disease.

Can I assemble this ahead of time?
Definitely. Assemble the full casserole, cover, and refrigerate for up to a day. Add about 10 extra minutes to the bake time when cooking from cold.

How do I store leftovers?
Refrigerate in an airtight container for up to 4 days. Reheat individual portions in the microwave or warm the whole dish in a 350°F oven until hot and bubbly again.

Serving Suggestions

Serve generous scoops as a vegetarian main alongside a crisp green salad and some crusty bread for soaking up the tomato juices. As a side, it pairs wonderfully with roasted chicken, baked fish, or Italian sausage. However you plate it, don’t skip that rest time before serving — it lets the casserole set up into perfect scoopable portions.

Cozy, cheesy, and full of garden-fresh flavor, this spaghetti squash bake is proof that lighter comfort food can still feel like a warm hug.

Recipe Card

Golden Parmesan Spaghetti Squash & Tomato Bake

Tender spaghetti squash baked with juicy tomatoes, fresh herbs and a golden Parmesan crust — a cozy vegetarian casserole that feeds 8.

Prep Time: 20 minutes | Cook Time: 1 hour | Total Time: 1 hour 20 minutes

Servings: 8 servings | Calories: ~128 kcal per serving (estimate)

Ingredients

• 1 medium spaghetti squash
• 2 cans (14.5 oz each) chopped tomatoes, drained
• 1 cup grated Parmesan cheese, divided
• 1/4 cup fresh oregano, chopped
• 1/4 cup fresh basil, chopped
• 2 cloves garlic, chopped
• 1/2 tsp salt

Instructions

1. Preheat oven to 400°F; coat a 9×13-inch baking dish with cooking spray.
2. Pierce the whole squash in several places with a sharp knife.
3. Microwave on medium-high 10-15 minutes, turning every 5 minutes, until tender.
4. Let cool 5-10 minutes until safe to handle.
5. Halve lengthwise, discard seeds, and scrape flesh into strands with a fork.
6. Mix strands in the baking dish with tomatoes, 3/4 cup Parmesan, oregano, basil, garlic, and salt.
7. Sprinkle remaining 1/4 cup Parmesan over the top.
8. Bake 45-60 minutes until bubbling and golden; rest a few minutes before serving.

Notes: Calories are an estimate.