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Golden slice of Spaghetti Squash Au Gratin with melted mozzarella and a crisp Parmesan crust, plated and ready to serve.

Cheesy Creamy Spaghetti Squash Au Gratin – A Cozy Comfort Dinner

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  • Author: Jennifer
  • Prep Time: 20 minutes
  • Cook Time: 40 minutes
  • Total Time: 1 hour
  • Yield: 4 servings 1x
  • Category: Dinner

Description

A silky, cheesy spaghetti squash casserole that bakes to a golden crust—eggs and Greek yogurt bind tender squash strands with gooey mozzarella and nutty Parmesan for a comforting, lower-carb side or light main.


Ingredients

Scale
  • 2 Eggs
  • 3 cups Cooked spaghetti squash, shredded into strands
  • Freshly ground black pepper
  • 1/2 tsp Dried thyme
  • 1 cup Shredded mozzarella cheese
  • 2 tbsp Fresh garlic, finely minced
  • Kosher salt
  • 1/2 cup Grated Parmesan cheese
  • 1/2 cup Plain Greek yogurt (full-fat if you want extra creaminess)


Instructions

  1. Preheat your oven to 400°F (200°C) and grease a medium casserole dish so the bake releases easily.

  2. In a large mixing bowl, combine the cooled spaghetti squash with the eggs, Greek yogurt, and shredded mozzarella. Stir until everything is evenly incorporated and the mixture looks creamy.

  3. Add the minced garlic, dried thyme, a generous pinch of salt, and a few grinds of black pepper. Mix thoroughly so the seasonings distribute through the squash.

  4. Spoon the mixture into the prepared dish and spread it into an even layer. Scatter the grated Parmesan over the top to create a savory crust.

  5. Bake on the middle rack for about 25–35 minutes, or until the top turns lightly golden and the center feels set. Oven times vary, so check for a subtle browning rather than deep color.

  6. Remove from the oven and let the casserole rest for 8–10 minutes; this helps it firm up for cleaner slices. Serve warm.

 

Quick tip: if your squash seems watery, drain it in a sieve and pat dry before mixing to prevent a soggy casserole.