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Kabocha Squash Soufflé

Servings 6
Calories 247 kcal
Author Harriet Trezevant


  • 1-1/2 cups whole milk
  • 2 sprigs fresh thyme
  • 3 1/2-inch slices white onion
  • 2 whole cloves
  • 3 tablespoons unsalted butter, plus more for greasing
  • 1/4 cup finely grated Parmesan cheese
  • 1 cup Roasted, Pureed Kabocha Squash (recipe below), drained at least 30 minutes
  • Kosher salt and freshly ground pepper
  • 3 tablespoons white rice flour
  • 4 egg yolks
  • 1 cup grated Gruyère cheese
  • 1/2 teaspoon ground sage, or 1 teaspoon minced fresh sage leaves
  • 6 egg whites, at room temperature


  1. In a small saucepan, bring the milk, thyme, onion, and cloves to a simmer. Turn off the heat and let steep for 15 minutes
  2. Butter a 12-cup gratin dish or a 10-cup soufflé dish, which is traditionally deeper (a wider dish will rise less but will cook faster). Sprinkle the Parmesan along the inner sides of the dish.
  3. Place the drained squash in a large bowl. Season to taste with salt and pepper, being aware that the Gruyère will also add saltiness. Set aside.
  4. Preheat the oven to 400°F. In a small saucepan over low heat, melt the butter, making sure it doesn’t brown. Whisk in the rice flour and cook over medium-low heat, stirring often, until the mixture begins to turn golden brown.
  5. Strain the milk, discarding the solids, whisk into the flour mixture, and cook, stirring constantly, until the mixture just begins to thicken, about 1 minute. Pour into the bowl of squash and mix well. Slowly add the egg yolks, two at a time, stirring constantly. Add the Gruyère and sage and mix well.
  6. In the bowl of a stand mixer with a whisk attachment or by hand, whisk the egg whites with a pinch of salt until stiff peaks form. Gently fold into the squash mixture in thirds, making sure the whites are fully incorporated and no white streaks remain. Pour into the prepared dish.
  7. Place the dish in the center of the oven, immediately lower the temperature to 375°F, and bake until the soufflé is golden brown on top and firm around the sides, about 30 minutes.
  8. If you want a more solid center or you’re using a deeper dish, bake for about 5 minutes longer. Try to keep the oven door closed to allow the soufflé to rise to its full potential. Serve immediately.
Nutrition Facts
Kabocha Squash Soufflé
Amount Per Serving
Calories 247 Calories from Fat 162
% Daily Value*
Fat 18g28%
Saturated Fat 10g63%
Cholesterol 175mg58%
Sodium 204mg9%
Potassium 174mg5%
Carbohydrates 7g2%
Fiber 1g4%
Sugar 2g2%
Protein 14g28%
Vitamin A 906IU18%
Vitamin C 3mg4%
Calcium 316mg32%
Iron 1mg6%
* Percent Daily Values are based on a 2000 calorie diet.