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Zucchini and Yellow Squash Au Gratin

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Tender zucchini and yellow squash slices baked in a rich, cheesy cream sauce, topped with a golden, crispy finish. This easy and comforting Zucchini and Yellow Squash Au Gratin is perfect as a side for any meal!

Ingredients

Scale
  • 2 medium zucchinis, thinly sliced
  • 2 medium yellow squashes, thinly sliced
  • 2 tablespoons butter
  • 2 cloves garlic, minced
  • 1 cup heavy cream
  • 1 cup shredded Gruyère cheese (or Swiss cheese)
  • 1/2 cup grated Parmesan cheese
  • 1/2 cup shredded mozzarella cheese
  • 1/2 teaspoon dried thyme
  • 1/2 teaspoon onion powder
  • Salt and black pepper, to taste
  • 1/2 cup breadcrumbs (panko or regular)
  • 1 tablespoon olive oil
  • Fresh parsley, chopped (for garnish, optional)

Instructions

  1. Preheat your oven to 375°F (190°C). Lightly grease a 9×13-inch baking dish.
  2. Thinly slice the zucchini and yellow squash into even rounds (about 1/8-inch thick).
  3. In a large skillet, melt butter over medium heat. Add minced garlic and cook for 1-2 minutes until fragrant. Pour in heavy cream, then stir in Gruyère, Parmesan, thyme, onion powder, salt, and pepper. Cook until the cheese is melted and the sauce is smooth.
  4. Arrange the sliced squash evenly in the prepared baking dish. Pour the creamy cheese sauce over the squash, coating evenly.
  5. Sprinkle mozzarella cheese evenly over the top. In a small bowl, mix breadcrumbs with olive oil and sprinkle over the dish.
  6. Bake for 25–30 minutes, or until the top is golden brown and the squash is tender.
  7. Let cool for a few minutes. Garnish with chopped fresh parsley if desired and serve warm.

Notes

  • Try salting the sliced squash lightly and letting it sit for 10 minutes, then pat dry before assembling to reduce extra moisture.
  • Gruyère cheese adds a wonderful nutty flavor, but you can substitute with sharp white cheddar or Swiss if needed.
  • For a richer flavor, add a pinch of nutmeg to the sauce.

Nutrition

Find it online: https://deliceflash.com/zucchini-and-yellow-squash-au-gratin/