If you’re craving something uniquely comforting with a tropical twist, this Hawaiian Baked Spaghetti Squash Casserole Recipe is exactly what you need. Combining the delicate, noodle-like strands of roasted spaghetti squash with the sweet tang of pineapple, the savory richness of ham, and melty mozzarella, this casserole brings a joyous explosion of flavors and textures that’s both nutritious and incredibly satisfying. It’s a fantastic way to enjoy a lighter, gluten-free meal that still feels indulgent and perfect for sharing with family or friends.

Ingredients You’ll Need

A clear glass bowl sits on a white marbled surface, filled with four distinct layers visible from above: yellow shredded squash or spaghetti squash on the top left, red tomato sauce with herbs including green dried oregano in the middle, and white shredded cheese covering the right side. A wooden spoon rests inside the bowl on the right side with some cheese on it. Around the bowl, there is a small white bowl with red sauce in the upper left, a white egg carton with three white eggs on the lower left, and a metal grater with shredded cheese scattered below the bowl. A white cloth with red stripes is on the right side. Photo taken with an iphone --ar 4:5 --v 7

Gathering simple, fresh ingredients is the key to making this Hawaiian Baked Spaghetti Squash Casserole Recipe come alive. Each item plays an important role, from bringing brightness to adding creaminess or a touch of sweetness, ensuring every bite bursts with flavor and balance.

1 medium spaghetti squash (about 2 1/2 pounds): This is the star that transforms into those delightful noodle-like strands when baked.

2 teaspoons extra-virgin olive oil: Adds richness and helps to enhance the squash’s natural sweetness.
Salt: Essential to bring out all the flavors harmoniously.
Pepper: A little kick that wakes up the taste buds without overpowering the dish.
3/4 cup organic pizza sauce: Gives the casserole a zesty tomato base that complements the tropical and savory elements.

1 tablespoon tomato paste: Adds depth and intensifies the tomato flavor, making it more robust.
1 large egg: Acts as the perfect binder, holding everything together gently.
1/2 teaspoon Italian seasoning: Infuses a subtle herby aroma that elevates the overall profile.

1 1/4 cups mozzarella cheese (5 1/2 ounces, packed and divided): Brings that irresistible gooey, melty texture and creamy taste.
10 slices thin-cut deli ham (divided): Adds a savory, meaty layer balanced by its smoky undertones.
3/4 cup pineapple tidbits: The sweet surprise that brightens the casserole and adds a tropical flair.

How to Make Hawaiian Baked Spaghetti Squash Casserole Recipe

Step 1: Preheat the Oven

Begin by setting your oven to 400°F and lining a baking sheet with foil for easy cleanup. Preheating ensures your squash will bake evenly, creating the perfect tender strands for this casserole.

Step 2: Prepare the Spaghetti Squash

With a sharp knife, carefully slice the squash in half and scoop out the seeds. This step is crucial to get those beautiful strands. Then, rub the inside with olive oil and sprinkle salt and pepper to season the base flavors.

Step 3: Bake the Spaghetti Squash

Place the halves cut-side up on your lined baking sheet and roast for about 45-55 minutes until the flesh is tender enough to separate gently with a fork. Once baked, let it cool for 10-15 minutes to handle without burning yourself.

Step 4: Drain the Spaghetti Squash

This part is important to prevent a watery casserole. Scrape the squash strands into a colander lined with a paper towel to soak up excess moisture. Let it drain for around 10 minutes, then press gently with another towel to extract even more liquid.

Step 5: Whisk the Sauce Mixture

In a large bowl, combine the pizza sauce, tomato paste, the beaten egg, Italian seasoning, salt, and a pinch of pepper. Whisking these together creates a hearty, flavorful binder that will marry perfectly with the squash.

Step 6: Mix Ingredients

Add the well-drained spaghetti squash to the sauce bowl along with two-thirds of the mozzarella cheese. Stir until everything is evenly incorporated. This mixture forms the delicious base of your Hawaiian Baked Spaghetti Squash Casserole Recipe.

Step 7: Assemble the Casserole

Rub some olive oil onto a 9×9-inch pie plate to prevent sticking. Spread half of the squash mixture evenly at the bottom, then layer 7 slices of ham on top. Cover the ham with the remaining squash mixture, gently pressing down to create a smooth surface.

Step 8: Bake Until Set

Put your assembled casserole into the oven and bake for about 25 minutes until it feels firm and just set. This step ensures the layers meld nicely and the casserole holds shape when served.

Step 9: Add Toppings and Finish Baking

Sprinkle the remaining cheese over the center of the casserole, leaving the edges bare to mimic a crust look. Tear the remaining ham slices and scatter them on top, followed by the pineapple tidbits. Return it to the oven for another 5-10 minutes until the cheese melts and bubbles beautifully.

Hawaiian Baked Spaghetti Squash Casserole Recipe Is Ready to Serve

Once out of the oven, let the casserole cool slightly before slicing. This warming, cheesy, and lightly sweet layer bake is now ready to delight your plate and your palate!

How to Serve Hawaiian Baked Spaghetti Squash Casserole Recipe

The image shows a round pizza on a clear glass dish placed on a white marbled surface. The pizza has a crispy, golden-brown crust. The first layer is melted white cheese that covers the whole pizza. On top of the cheese, there are pieces of pink ham spread evenly across the pizza. Large yellow pineapple chunks are scattered on top of the ham. The pizza is cut into eight triangular slices. Around the pizza, there are small white bowls with shredded cheese, dried herbs, and a white bowl with pineapple pieces, along with two forks on a white plate and a white cloth with red stripes. A small bowl of red sauce with a spoon, salt and pepper shakers, and a cheese grater are also visible around the pizza. photo taken with an iphone --ar 4:5 --v 7

Garnishes

Fresh herbs like chopped parsley or basil create a lovely, fresh finish while a sprinkle of crushed red pepper adds a subtle kick if you like that little heat. A light drizzle of extra-virgin olive oil also brings out the golden crust’s shine and flavor.

Side Dishes

Brighten your meal with a crisp green salad tossed with lemon vinaigrette or a simple cucumber and tomato salad. For something heartier, steamed broccoli or roasted vegetables are fantastic companions that complement the tropical and cheesy notes of the casserole.

Creative Ways to Present

Try serving individual portions in small ramekins for an elegant presentation, or bake this casserole in colorful ceramic dishes to add a cheerful vibe to your dining table. You could even top with extra pineapple tidbits for a visually vibrant garnish that adds texture.

Make Ahead and Storage

Storing Leftovers

Cool the casserole completely before covering and refrigerating in an airtight container. Leftovers are best enjoyed within 3-4 days and keep their flavor and texture nicely when stored properly.

Freezing

This casserole freezes wonderfully. After cooling, wrap it tightly with aluminum foil and place it in a freezer-safe container or bag. It can be frozen for up to 2 months, making it perfect for prep ahead meals or busy weeknight dinners.

Reheating

To reheat, thaw overnight in the fridge if frozen, then bake in a preheated 350°F oven for about 20 minutes until warmed through and bubbly. You can also microwave portions if in a rush, though baking maintains the best texture.

FAQs

Can I make this casserole vegan or dairy-free?

Absolutely! Swap mozzarella for vegan cheese alternatives, and use a flax or chia egg instead of a chicken egg to keep the binder in place. Choose a plant-based pizza sauce to maintain all the rich flavors without dairy.

Is spaghetti squash hard to cook?

Not at all! Baking it is straightforward and reliable. Cutting it in half and roasting until tender allows the flesh to soften perfectly and separate into those fun, spaghetti-like strands that make this recipe so delightful.

What if I don’t have deli ham?

You can substitute with cooked bacon, Canadian bacon, or even diced cooked chicken for a different but tasty variation. Each option adds a savory layer, complementing the sweet pineapple beautifully.

Can this recipe be made gluten-free?

Yes! Spaghetti squash is naturally gluten-free, and all other ingredients listed are gluten-free as well. Just be sure to check your pizza sauce and any seasonings for hidden gluten if you have high sensitivity.

How sweet does this casserole taste?

The sweetness is subtle and balanced by savory ham and melted cheese. The pineapple tidbits provide juicy pops of tropical sweetness that brighten each bite without overwhelming the overall flavor.

Final Thoughts

Giving this Hawaiian Baked Spaghetti Squash Casserole Recipe a try is like inviting a little sunshine to your dinner table. It’s a vibrant, comforting dish that’s as nourishing as it is delicious. Whether you’re feeding picky eaters, looking for a gluten-free option, or just craving something new and exciting, this recipe promises a rewarding cooking experience and a plate full of joy. So grab that spaghetti squash and get baking—your taste buds will thank you!