Squash Gratin

This image courtesy of Joseph DeLeo

Spaghetti squash has an appealing golden color, a mild flavor, and flesh that separates into strands when scraped with a fork. Here, the strands are folded into a gratin of aromatic rice, onions, and three cheeses.

NotesThe spaghetti squash and the mushroom-zucchini mixture may be cooked a day in advance and refrigerated in tightly lidded containers. Bring it to room temperature before proceeding with the recipe. The gratin may be assembled several hours in advance and kept, covered, at room temperature until baking time.

Makes6 to 8 servings

Cooking Methodbaking, roasting, sauteeing


Total Timeunder 2 hours

Make Ahead RecipeYes

Kid FriendlyYes

OccasionFamily Get-together

Recipe Coursemain course, side dish

Dietary Considerationegg-free, gluten-free, halal, kosher, peanut free, soy free, tree nut free, vegetarian

Equipmentbaking/gratin dish


Taste and Texturebubbly, cheesy, garlicky, rich, savory

Type of Dishgratin, vegetable


  • 1 spaghetti squash
  • 6 tablespoons Extra Virgin Olive Oil, plus additional for greasing a gratin dish
  • Kosher or sea salt
  • Freshly Ground Black Pepper
  • 2 cups Homemade Vegetable Broth  or best-quality low-sodium canned vegetable broth
  • 1 cup aromatic long-grain rice, such as Basmati or Jasmine
  • 2 cloves garlic, sliced paper-thin
  • ½ pound cremini or button mushrooms, cleaned, trimmed, and thinly sliced
  • 1 small yellow onion, halved and sliced into thin half-rings
  • 2 small-to-medium zucchini, sliced into thin rounds
  • 1 tablespoon minced flat-leaf parsley
  • 1/3 cup shredded dry Jack Cheese
  • 1/3 cup cubed Fresh Mozzarella
  • 1/3 cup freshly grated Parmigiano Reggiano


  1. Heat the oven to 375°F. Cut the spaghetti squash in half length-wise and scoop out the seeds. Brush the flesh with 2 tablespoons of olive oil and sprinkle with a little salt and pepper. Place the squash, cut side down, on a rimmed baking sheet and bake until tender, about 45 minutes. Remove the squash from the oven and let it stand until it is cool enough to handle. Scrape the flesh into a bowl and set aside. Leave the oven on.

  2. While the squash is baking, bring the vegetable broth to a boil in a saucepan placed over medium-high heat. Carefully pour in the rice. When the liquid returns to a boil, reduce the heat to medium-low and cover. Cook the rice for about 15 minutes, until the grains are slightly underdone and the liquid has been absorbed. Transfer the rice to a large bowl and toss with 1 tablespoon of olive oil.

  3. Put the remaining 3 tablespoons of oil and the garlic in a large skillet or sauté pan and set the pan over medium-low heat. Sauté the garlic until it is softened but not at all browned, about 5 minutes. Add the mushrooms, onion, and zucchini and sprinkle with a little salt and pepper. Sauté the vegetables for about 10 minutes, until they are tender and the liquid they release has been reabsorbed. Stir in the parsley. Remove from the heat and transfer to a bowl. Let cool for a few minutes.

  4. Add the reserved spaghetti squash and the mushroom-zucchini mixture to the bowl with the rice. Add the dry Jack and mozzarella cheeses and gently but thoroughly fold everything together.

  5. Grease an 8-by-12-inch or similar-sized gratin dish with a little olive oil. Pour the rice-vegetable mixture into the dish and sprinkle the Parmigiano on top. Bake the gratin for 20 to 25 minutes, or until the top is golden brown and the edges are crusty. Remove the gratin from the oven and let it rest for 5 to 10 minutes before serving.


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