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Spaghetti Squash Au Gratin

This spaghetti squash au gratin is a creamy, savory baked casserole made with tender cooked squash, eggs, yogurt, mozzarella, Parmesan, garlic, and thyme. The dish bakes until lightly golden on top, creating a rich and flavorful side dish with a satisfying gratin-style finish.
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Course: Side Dish
Cuisine: American
Keyword: Spaghetti Squash Au Gratin
Prep Time: 10 minutes
Cook Time: 30 minutes
Resting Time: 10 minutes
Total Time: 50 minutes

Ingredients

  • 1/2 cup plain Greek yogurt full-fat preferred for a creamier consistency
  • 1/2 cup Parmesan cheese finely grated
  • 2 tablespoons garlic freshly minced for the best flavor
  • 3 cups cooked spaghetti squash cooled before mixing
  • Salt added according to taste
  • 1 cup mozzarella cheese shredded
  • 1/2 teaspoon dried thyme
  • Pepper added according to taste
  • 2 eggs

Instructions

  • Preheat the oven to 400°F (200°C) so it is fully heated before the casserole is placed inside.
  • In a large mixing bowl, place the cooked and cooled spaghetti squash, eggs, shredded mozzarella, and Greek yogurt. Stir until the ingredients are evenly incorporated and the mixture has a cohesive, creamy texture.
  • Add salt, pepper, minced garlic, and dried thyme to the squash mixture. Mix thoroughly so the seasonings are distributed throughout the casserole base.
  • Transfer the seasoned mixture into a lightly greased casserole dish. Spread it into an even layer, then sprinkle the grated Parmesan cheese over the top to create a savory crust as it bakes.
  • Bake the casserole in the preheated oven for about 30 minutes, or until the surface is lightly browned and the mixture is set.
  • Remove the casserole from the oven and let it rest for 10 minutes before serving. This allows the dish to firm slightly, making it easier to portion.
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Notes

Freshly minced garlic provides the most pronounced flavor.
Full-fat Greek yogurt gives the casserole a richer, smoother texture.