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Zucchini gratin with creamy zucchini, cheese and crispy breadcrumbs.

Zucchini Gratin

This zucchini gratin is layers of tender sauteed zucchini and cheese in a creamy sauce, topped with breadcrumbs and baked to perfection. A simple yet elegant side dish!
Course Side Dish
Cuisine American
Prep Time 10 minutes
Cook Time 30 minutes
Total Time 40 minutes
Servings 6
Calories 366kcal
Author Sara Welch


  • 4 tablespoons butter divided use
  • 2 tablespoons flour
  • 1 1/2 pounds zucchini cut into 1/2 inch slices
  • 1/2 cup onion diced
  • salt and pepper to taste
  • 1/4 teaspoon dried thyme
  • 1/2 cup heavy cream
  • 3/4 cup milk
  • 2 cups shredded Monterey Jack cheese
  • 1/2 cup Italian breadcrumbs
  • 1 tablespoon chopped parsley
  • cooking spray


  • Melt 2 tablespoons of butter in a large pan over medium heat. Preheat the oven to 350 degrees F.
  • Add the zucchini and onion to the pan and cook for 5-6 minutes or until vegetables are tender. Season with salt and pepper to taste.
  • Remove the zucchini mixture from the pan and place in a bowl. Cover to keep warm.
  • Wipe out the pan with a paper towel.
  • Melt the remaining 2 tablespoons of butter in the pan. Add the flour and whisk to combine.
  • Cook the flour mixture for 1 minute, stirring constantly.
  • Whisk in the milk and cook for 2-3 minutes. Add the cream, thyme and salt and pepper to taste.
  • Cook the sauce for an additional 2 minutes or until just thickened.
  • Coat a 6 cup baking dish with cooking spray.
  • Place 1/4 of the sauce in the bottom of the pan.  
  • Add 1/3 of the zucchini mixture.
  • Top the zucchini mixture with 1/4 of the sauce and 1/3 of the cheese.
  • Continue layering the zucchini, sauce and cheese. 
  • Sprinkle the breadcrumbs over the top of the final layer.
  • Bake for 20 minutes or until cheese has melted and breadcrumbs are golden brown.
  • Sprinkle with parsley and serve.


Calories: 366kcal | Carbohydrates: 15g | Protein: 13g | Fat: 21g | Saturated Fat: 17g | Cholesterol: 83mg | Sodium: 432mg | Potassium: 424mg | Fiber: 1g | Sugar: 5g | Vitamin A: 1110IU | Vitamin C: 21.5mg | Calcium: 370mg | Iron: 1.4mg