Zucchini and Yellow Squash Au Gratin: A Sumptuous Side Dish

Introduction to Comforting Veggie Delight

Zucchini and Yellow Squash Au Gratin is a comforting and flavorful side dish that elevates the humble zucchini and yellow squash into a decadent culinary experience. With layers of tender squash slices bathed in a creamy, cheesy sauce and topped with a golden breadcrumb crust, this au gratin is sure to impress even the most discerning palates. Whether served alongside a hearty main course or enjoyed as a vegetarian entrée, this dish is a delightful way to showcase the bounty of summer produce.

Ingredients for Creamy Goodness

To prepare this indulgent dish, gather the following ingredients:

  • Zucchini and Yellow Squash: Choose two medium-sized zucchinis and two medium-sized yellow squash, slicing them into rounds to create the base of the au gratin.
  • Butter: Use unsalted butter to sauté the squash and create a rich, flavorful sauce for the au gratin.
  • All-Purpose Flour: Flour acts as a thickening agent for the creamy sauce, helping to achieve the desired consistency.
  • Milk: Whole milk provides the creamy base for the sauce, infusing it with richness and flavor.
  • Shredded Cheese: A blend of shredded cheese, such as sharp cheddar or gruyere, adds depth of flavor and gooey, melty goodness to the au gratin.
  • Garlic: Fresh garlic cloves, minced or finely chopped, impart aromatic flavor to the dish, enhancing its savory profile.
  • Seasonings: Salt, black pepper, and optionally, herbs like thyme or rosemary, season the sauce and enhance the overall taste of the au gratin.
  • Breadcrumb Topping: A crunchy breadcrumb topping adds texture and visual appeal to the dish, creating a golden crust when baked.

Preparation Steps for Creamy Delight

  1. Preheat the Oven: Preheat your oven to 375°F (190°C) and lightly grease a baking dish with butter or cooking spray.
  2. Sauté the Squash: In a large skillet, melt butter over medium heat. Add the sliced zucchini and yellow squash rounds and sauté until they are just tender, about 5-7 minutes. Remove from heat and set aside.
  3. Prepare the Sauce: In the same skillet, melt additional butter over medium heat. Stir in the minced garlic and cook until fragrant, about 1 minute. Sprinkle in the all-purpose flour and whisk continuously to form a roux. Gradually pour in the milk while whisking constantly, until the mixture thickens and becomes smooth. Season with salt, black pepper, and any desired herbs.
  4. Add Cheese: Remove the sauce from heat and stir in the shredded cheese until it is fully melted and incorporated into the sauce, creating a creamy cheese sauce.
  5. Assemble the Au Gratin: Arrange the sautéed zucchini and yellow squash slices in an even layer in the prepared baking dish. Pour the cheese sauce evenly over the squash, ensuring that it coats the vegetables completely.
  6. Top with Breadcrumbs: Sprinkle the breadcrumb topping evenly over the cheese sauce, covering the entire surface of the au gratin.
  7. Bake Until Golden: Place the baking dish in the preheated oven and bake for 25-30 minutes, or until the au gratin is bubbling and the breadcrumb topping is golden brown and crisp.
  8. Serve and Enjoy: Remove the au gratin from the oven and let it cool for a few minutes before serving. Garnish with fresh herbs, if desired, and serve hot as a delectable side dish alongside your favorite main course.


In conclusion, Zucchini and Yellow Squash Au Gratin is a delightful way to enjoy the bounty of summer produce in a comforting and flavorful dish. With its tender squash slices, creamy cheese sauce, and golden breadcrumb topping, this au gratin is sure to become a favorite among family and friends alike. Whether served as a side dish or enjoyed as a vegetarian entrée, this dish offers a satisfying and delicious way to celebrate the flavors of the season. So gather your ingredients, preheat your oven, and treat yourself to a taste of creamy, cheesy goodness with this irresistible zucchini and yellow squash au gratin.