If you are on the lookout for a comforting, healthy, and vibrant meal that feels like a warm hug, this Spaghetti Squash Casserole with Broccoli, Spinach, and Marinara Recipe is exactly what you need. Combining the natural sweetness and tender strands of roasted spaghetti squash with the fresh crunch of broccoli, the deep earthiness of spinach, and a luscious, cheesy marinara sauce, this casserole offers a delightful balance of flavors and textures. It’s perfect for cozy family dinners or as a wholesome dish to impress friends, all while being naturally gluten-free and adaptable for various dietary preferences. Get ready to fall in love with this gorgeous, vegetable-packed casserole!

Ingredients You’ll Need

The image shows fresh cooking ingredients arranged on a white marbled surface. At the center right, there are two halves of a bright yellow spaghetti squash with a smooth inner texture. Surrounding the squash are small white bowls containing vibrant green spinach leaves, chopped broccoli, and a mix of shredded yellow and white cheese. There is also a medium-sized yellow onion with a smooth skin placed near the squash. Additionally, a black measuring cup filled with creamy white sauce and a white bowl containing rich red tomato sauce are visible. The overall scene is colorful with fresh, raw ingredients neatly placed, ready for cooking. photo taken with an iphone --ar 4:5 --v 7

What’s fantastic about this recipe is how straightforward yet essential each ingredient is. Every component plays a crucial role, from adding texture and flavor to bringing color and nutrition to the dish. Let’s dive into what you’ll need to make this casserole truly shine.

Spaghetti squash: This is the star that provides those delightful noodle-like strands, serving as a wholesome pasta substitute packed with vitamins.
Sea salt: Used to season the squash and veggies properly, enhancing their natural flavors.
Light olive oil: Adds a subtle fruity richness while sautéing the vegetables, ensuring they cook perfectly without losing their crunch.
Chopped onion: Adds a sweet, aromatic base that complements the other veggies beautifully.
Chopped broccoli: Brings earthiness, crunch, and vibrant green color, boosting the nutritional profile.
Baby spinach: Offers mild, tender greens that wilt down to a silky texture, melding nicely with the sauce.
Black pepper: A pinch of sharpness to balance the richness and complement the seasoning.
Cream cheese (or dairy-free alternative): Creates a rich and creamy texture that binds the sauce and ingredients together with indulgence.
Marinara sauce: Bursting with tomatoes, herbs, and a hint of garlic, it adds depth, acidity, and that quintessential Italian flair.
Parmesan cheese: Brings a salty, nutty umami kick that enriches the overall flavor.
Garlic powder, onion powder, Italian seasoning: These spices layer in robust flavor, perfecting the sauce with warmth and complexity.
Kosher salt, red pepper flakes: Essential for seasoning balance and a subtle touch of heat to awaken the palate.
Optional cooked shredded chicken or turkey: Adds protein and heartiness, turning the casserole into a full meal if desired.
Organic shredded cheese (or dairy-free substitute): Topping the casserole to golden, melty perfection that makes every bite irresistible.
Fresh parsley: For a bright, fresh garnish that adds a pop of color and herbal brightness.

How to Make Spaghetti Squash Casserole with Broccoli, Spinach, and Marinara Recipe

Step 1: Roast the Spaghetti Squash

Start by preheating your oven to 400 degrees Fahrenheit and lining a baking pan with foil. Slice the spaghetti squash in half and scoop out the seeds. Give each half a generous sprinkle of sea salt before placing them cut side down on the pan. Roast for about 45 minutes until the flesh is fork-tender and easily pulls away in spaghetti-like strands. This roasting step brings out the natural sweetness while softening the squash perfectly for your casserole base.

Step 2: Prepare the Veggie Mix

Once the squash has cooled enough to handle, use a fork to scrape out those beautiful noodle-like strands into a large bowl. Next, reduce your oven temperature to 350 degrees Fahrenheit. In an oven-safe skillet or cast iron pan, heat olive oil on medium-high. Toss in the chopped onions, broccoli, spinach, plus a pinch of salt and black pepper. Sauté for 3 to 5 minutes until the vegetables become tender yet retain a little bite. Then add them to the bowl with the squash strands. This step builds a vibrant vegetable layer that keeps the casserole fresh and lively.

Step 3: Make the Creamy Marinara Sauce

In the same skillet, add cream cheese, marinara sauce, parmesan, garlic and onion powders, Italian seasoning, kosher salt, black pepper, and a pinch of red pepper flakes. Whisk everything together gently over medium-low heat until the cream cheese melts and the sauce is smooth and luscious. This creamy marinara is the heart of the casserole—it ties all ingredients together with its rich taste and velvety texture.

Step 4: Combine and Bake

Into the skillet with the sauce, fold in the spaghetti squash mixture and, if you’re using it, the cooked shredded chicken or turkey. Mix gently until everything is well coated. Sprinkle the shredded cheese evenly on top and pop your oven-safe skillet into the oven for 20 to 25 minutes. You want the cheese melted, bubbly, and turning a gorgeous golden brown. When done, your casserole will have a beautiful crust that invites you to dive right in.

How to Serve Spaghetti Squash Casserole with Broccoli, Spinach, and Marinara Recipe

A close-up view of a white pan filled with a layered cheesy dish, showing at least two visible layers: a melted golden-yellow and white cheese layer on top with a slightly browned texture, and below it, a rich, saucy filling mixed with small bits of greens and tender pasta or noodles. A silver spoon is scooping a portion, revealing the layered textures clearly, resting on a white marbled surface. Some small bits of green herbs are sprinkled lightly on the cheese. The photo taken with an iphone --ar 4:5 --v 7

Garnishes

Fresh parsley is the perfect finishing touch. Its bright, herbaceous flavor cuts through the richness and adds a lovely splash of green that makes the casserole look even more appetizing. Feel free to sprinkle extra parmesan for an added salty pop right before serving.

Side Dishes

This hearty casserole shines as a main dish, but pairing it with a light, crisp salad dressed with lemon vinaigrette enhances the meal beautifully. Garlic bread or a simple crusty loaf is also welcome, giving an extra touch of comfort and crunch for soaking up sauce.

Creative Ways to Present

For a special occasion, scoop the casserole into individual ramekins and top with a little more cheese and fresh herbs for a personalized touch. Alternatively, serve it family-style straight from the skillet so everyone can enjoy the bubbling, cheesy goodness together – it’s such a warm, inviting way to share this delightful Spaghetti Squash Casserole with Broccoli, Spinach, and Marinara Recipe.

Make Ahead and Storage

Storing Leftovers

Place any leftovers in an airtight container and refrigerate for up to 4 days. The flavors actually deepen and meld beautifully when rested overnight, making for an even tastier next-day meal.

Freezing

This casserole freezes wonderfully. Portion it into freezer-safe containers and store for up to 3 months. Just thaw overnight in the fridge before reheating to maintain the best texture and flavor.

Reheating

Reheat leftovers in the oven at 350 degrees Fahrenheit for about 15-20 minutes or until warmed through and the cheese becomes bubbly again. If you’re in a hurry, microwaving works too—just cover loosely to prevent drying out, and stir halfway through heating for even warmth.

FAQs

Can I use another type of squash for this casserole?

While spaghetti squash is unique for its noodle-like strands, you could experiment with other winter squashes. But keep in mind they have different textures and moisture content, so the final dish might be less “pasta-like.”

Is the Spaghetti Squash Casserole with Broccoli, Spinach, and Marinara Recipe suitable for vegans?

Absolutely! Just swap out the dairy cream cheese and cheeses for plant-based alternatives. The marinara and veggies keep it naturally vegan, creating a delicious and wholesome casserole.

Can I prepare this casserole without an oven-safe skillet?

If you don’t have an oven-safe pan, combine everything in a baking dish after making the sauce on the stovetop. Top with cheese and bake as directed for similar results.

How can I speed up cooking the spaghetti squash?

You can microwave the squash halves face down for around 10-12 minutes instead of roasting, then scrape out the strands. This saves time but roasting adds more flavor.

What’s the best marinara sauce to use?

Choose a high-quality marinara that balances acidity with sweetness and herbs. Homemade or your favorite store-bought brand will work great. The sauce is a key player in this Spaghetti Squash Casserole with Broccoli, Spinach, and Marinara Recipe.

Final Thoughts

There is something so satisfying about this Spaghetti Squash Casserole with Broccoli, Spinach, and Marinara Recipe that makes it a standout in any weeknight rotation. From the comforting, cheesy topping to the fresh veggies and tender squash strands beneath, every bite feels like a celebration of wholesome, delicious ingredients. Whether you’re cooking for family or craving a cozy meal just for yourself, this casserole brings warmth and joy to the table every time. Give it a try—you might just find your new favorite comfort food!