Go Back
–+ servings
Zucchini gratin in a white bowl

Zucchini Gratin

5 from 8 votes
Sliced squash and caramelized onions in a light cream sauce is topped with cheese and toasted breadcrumbs in this delicious zucchini gratin.
Prep Time 20 minutes
Cook Time 50 minutes
Total Time 1 hour 10 minutes
Servings8 servings
Print
Share

Equipment

Ingredients

  • 6 tablespoons butter
  • 1 pound yellow onions cut in half and sliced (about 3 large)
  • 2 pounds zucchini and/or yellow squash sliced 1/4-inch thick (about 4 medium zucchini)
  • 2 teaspoons kosher salt use 1/2 teaspoon if using table salt
  • ½ teaspoon freshly ground black pepper
  • ¼ teaspoon ground nutmeg
  • 2 cloves garlic finely minced or pressed
  • 2 tablespoons all-purpose flour
  • 1 cup warm milk
  • ¾ cup Italian style bread crumbs
  • ¾ cup grated Gruyere

Instructions

  • Preheat the oven to 400 degrees F.
  • Melt the butter in a very large sauté pan and cook the onions over low heat for about 20 minutes, or until tender but not browned.  As the onions are cooking, stir them occasionally and work on prepping the other ingredients.
  • Add the zucchini to the pan and cook, covered, for 8-10 minutes, or until tender. Add the salt, pepper, nutmeg, and garlic and cook uncovered for 5 more minutes, stirring often.
  • Whisk flour into the milk and add to pan, turning up heat slightly just until milk heats and starts bubbling.  Then cook over low heat for a few minutes, until it thickens and makes a sauce. Pour the zucchini mixture, and all the sauce into an 8 by 10-inch baking dish (or something close to that).
  • Combine the bread crumbs and Gruyere and sprinkle on top of the zucchini mixture. Drizzle a little olive oil over the top (place your finger over the opening of the bottle to make it easier to just drizzle a little) and bake for 20 minutes, or until bubbly and browned.  Cool for a few minutes before serving.

Notes

Recipe (with very minor changes) from Ina Garten.

Nutrition

Calories: 255kcal, Carbohydrates: 24g, Protein: 8g, Fat: 15g, Saturated Fat: 9g, Polyunsaturated Fat: 1g, Monounsaturated Fat: 4g, Trans Fat: 0.3g, Cholesterol: 45mg, Sodium: 820mg, Potassium: 442mg, Fiber: 3g, Sugar: 7g, Vitamin A: 657IU, Vitamin C: 25mg, Calcium: 198mg, Iron: 1mg
Course: Side Dishes
Cuisine: American
Keyword: zucchini gratin
Calories: 255kcal
Author: Our Best Bites, adapted from Ina Garten
Did You Make This Recipe?Snap a picture, and hashtag it #ourbestbites. We love to see your creations on our Instagram @ourbestbites!