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Gluten-Free Whole30 Roasted Spaghetti Squash Casserole with Cashew Cream

By Freeflourish Test KitchenReviewed by Freeflourish Editorial TeamPublished May 8, 2026 · Updated May 11, 2026
American-inspired 65 mins glutenfreewhole30dairyfreepaleofamilymealcomfortfoodmaincourseeasymealprep

This nutritious gluten-free casserole combines roasted spaghetti squash with a creamy, dairy-free cashew sauce, making it a Whole30, paleo, and family-friendly dinner.

Gluten-Free Whole30 Roasted Spaghetti Squash Casserole with Cashew Cream
Prep 15 min
Cook 50 min
Total 65 min
Servings 6
Difficulty easy
Cuisine American-inspired

Recipe Details

Prep15 min
Cook50 min
Total65 min
Servings6
Difficultyeasy
CuisineAmerican-inspired
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Ingredients

Servings 6
  • 1 large spaghetti squash (about 3-4 pounds)
  • 2 tablespoons olive oil, divided
  • 1 medium yellow onion, finely chopped
  • 3 cloves garlic, minced
  • 1 red bell pepper, diced
  • 1 cup cremini mushrooms, sliced
  • 1 teaspoon dried thyme
  • 1 teaspoon smoked paprika
  • 1/2 teaspoon sea salt, plus more to taste
  • 1/4 teaspoon freshly ground black pepper
  • 1 1/2 cups raw cashews (soaked in hot water for at least 2 hours or overnight, then drained)
  • 1/2 cup water
  • 2 tablespoons lemon juice
  • 1 tablespoon nutritional yeast
  • 1/2 teaspoon garlic powder
  • Fresh parsley, chopped (for garnish, optional)

Instructions

  1. Preheat your oven to 400°F (200°C).
  2. Cut the spaghetti squash in half lengthwise and scoop out the seeds. Drizzle 1 tablespoon of olive oil over the cut surfaces and season with a pinch of salt.
  3. Place the squash halves cut-side down on a baking sheet lined with parchment paper. Roast for 40 minutes or until the flesh is tender and easily shredded with a fork.
  4. While the squash roasts, heat the remaining 1 tablespoon olive oil in a large skillet over medium heat.
  5. Add chopped onion and sauté for about 5 minutes until translucent.
  6. Add minced garlic, diced red bell pepper, and sliced mushrooms. Cook for another 5-7 minutes until the vegetables are softened.
  7. Stir in dried thyme, smoked paprika, salt, and black pepper. Remove from heat and set aside.
  8. Prepare the cashew cream sauce by blending soaked and drained cashews with water, lemon juice, nutritional yeast, garlic powder, and a pinch of salt until very smooth and creamy. Add more water if needed to reach a pourable consistency.
  9. When the spaghetti squash is cool enough to handle, use a fork to shred the flesh into strands and transfer to a large mixing bowl.
  10. Add the sautéed vegetable mixture to the shredded squash and mix gently to combine.
  11. Transfer the mixture into a greased 9x13 inch casserole dish, spreading evenly.
  12. Pour the cashew cream sauce evenly over the top of the squash and vegetables, smoothing gently with a spatula.
  13. Bake uncovered at 375°F (190°C) for 15 minutes to warm through and slightly brown the top.
  14. Remove from oven and let rest for 5 minutes before serving. Garnish with fresh parsley if desired.
  15. Serve warm as a satisfying Whole30, paleo, gluten-free, dairy-free main course. Store leftovers in an airtight container in the fridge for up to 4 days.

Frequently Asked Questions

Reader questions and answers for this recipe will appear here.

This Gluten-Free Whole30 Roasted Spaghetti Squash Casserole with Cashew Cream is naturally gluten-free, dairy-free, paleo, and Whole30 compliant. Here are adaptable options to further customize it:

  • Cashew Cream: For a nut-free, dairy-free alternative, use soaked sunflower seeds blended with water, lemon juice, and seasonings for a creamy sauce.
  • Vegetables: Swap bell pepper and mushrooms for zucchini or eggplant to fit seasonal availability or personal tastes while retaining vegetable richness.
  • Spices: Replace smoked paprika with regular paprika or ground cumin for a milder flavor if preferred.
  • Oils: Olive oil is great for roasting and sautéing; for a paleo variation, avocado or coconut oil are excellent substitutions.

These swaps keep the dish aligned with gluten-free, dairy-free, paleo, and Whole30 standards, ensuring it remains an easy, nutritious, and family-friendly main course.

Allergen Overlap Note

While all recipes in our gluten-free category—including Breakfast, Lunch, Dinner, Desserts, Snacks, Soups & Salads, Gluten-Free Baking, and more—are developed to exclude gluten-containing ingredients, vigilance is essential to manage potential cross-contamination and allergen overlaps.

Many recipes also carry allergen-friendly tags such as dairy-free, nut-free, vegan, low carb, and paleo. However, ingredients like cashews used in dairy-free sauces or baked goods in gluten-free baking can pose allergy risks.

To ensure safe gluten-free cooking and dining:

  • Use separate utensils and cookware uncontaminated by gluten ingredients to prevent cross-contact.
  • Check labels on packaged goods for gluten or hidden allergens, even when marked gluten-free.
  • Clean prep areas thoroughly prior to making recipes, especially in shared kitchens.
  • Substitute allergenic ingredients carefully using verified gluten-free and allergy-safe alternatives.
  • Clearly communicate dietary restrictions when serving family and guests, particularly with recipes tagged family-friendly, kid-friendly, or holiday & seasonal.

Following these tips maintains the safety and integrity of our diverse gluten-free recipe collection, from comforting casseroles and holiday classics to quick snacks and gluten-free baking projects.

Texture Expectations

Gluten-free dishes often have unique textures unlike traditional gluten-containing meals, offering delicious alternatives and new experiences. In this Whole30 Roasted Spaghetti Squash Casserole, the roasted spaghetti squash provides a naturally tender, slightly stringy texture reminiscent of al dente pasta but lighter and vegetable-forward.

The sautéed vegetables add softness with gentle variation in bite, while the creamy dairy-free cashew sauce binds the casserole with a smooth, luscious coating, replacing dairy cheese or creams typically found in casseroles.

Because gluten contributes elasticity in baked goods, gluten-free casseroles rely on the natural textures of vegetables and nuts. This casserole is tender and creamy yet light, avoiding heaviness or gumminess. Roasting and baking add mild caramelization and warmth, creating a comforting meal.

Texture may vary depending on roasting time of the spaghetti squash and how finely the cashew cream is blended. This dish is ideal for those seeking wholesome, vegetable-centric meals with satisfying, nuanced textures instead of a typical pasta bake feel.

This nourishing, grain-free, and dairy-free casserole highlights the delightful texture diversity possible in gluten-free cooking, combining comfort and freshness in every bite.

Dining With Non Gf Family Note

Preparing gluten-free meals alongside family members who eat gluten requires mindful practices to ensure safety and enjoyment across all meal occasions—from Breakfast and Snacks to Dinners, Desserts, and Holiday & Seasonal favorites:

  • Use separate tools and surfaces: Designate cutting boards, utensils, and cookware for gluten-free and gluten-containing foods. Color-code or label to prevent mix-ups.
  • Clean thoroughly: Wash all surfaces and equipment carefully before gluten-free cooking. Even tiny gluten traces can cause reactions.
  • Store ingredients separately: Keep gluten-free and gluten-containing products distinct in pantries and refrigerators.
  • Prepare gluten-free dishes first: Cooking gluten-free meals before others minimizes gluten transfer via flour dust or shared utensils.
  • Use appliances carefully: If sharing toasters or other devices, consider toaster bags or separate appliances for gluten-free foods.
  • Communicate with family: Educate everyone about preventing gluten cross-contact and collaborative kitchen practices.
  • Choose adaptable recipes: Many Family-Friendly and Quick & Easy dishes include gluten-free options so all can enjoy the same meal.
  • Label leftovers distinctly: Store gluten-free leftovers in clearly marked containers to avoid confusion during meal prep or reheating.

By adopting these habits, families can safely enjoy a wide range of tasty meals—from Gluten-Free Baking treats, hearty Soups & Salads, to comforting Comfort Food mains—harmoniously and with confidence even when sharing meals with gluten eaters.

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