French Green Vegetable au Gratin

Vegetable gratin
French green vegetable au gratin.

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  • Total: 55 mins
  • Prep: 10 mins
  • Cook: 45 mins
  • Yield: 1 casserole (4 to 6 servings)
Nutritional Guidelines (per serving)
326 Calories
18g Fat
28g Carbs
14g Protein
See Full Nutritional Guidelines Hide Full Nutritional Guidelines
Nutrition Facts
Servings: 1 casserole (4 to 6 servings)
Amount per serving
Calories 326
% Daily Value*
Total Fat 18g 24%
Saturated Fat 10g 48%
Cholesterol 42mg 14%
Sodium 526mg 23%
Total Carbohydrate 28g 10%
Dietary Fiber 4g 16%
Protein 14g
Calcium 367mg 28%
*The % Daily Value (DV) tells you how much a nutrient in a food serving contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.
(Nutrition information is calculated using an ingredient database and should be considered an estimate.)

Vegetable gratin is such a lovely, versatile dish. It makes a great side dish which works well with many meat and fish dishes. Then, eat a larger portion and you have a great main course, for a simple lunch or even a dinner, add crusty bread on the side and you also have a filling dish. 

The smallest hint of a secret ingredient, poultry seasoning, is nearly undetectable hidden in the cheese and green vegetable mixture, yet gives the dish a special complexity. If you are serving this dish for a vegetarian, then leave out the poultry stock. 


  • 1 small onion (finely chopped)
  • 1 tablespoon olive oil
  • 2 tablespoons all-purpose flour
  • 3/4 teaspoon salt
  • 1/4 teaspoon ground black pepper
  • 1/2 teaspoon poultry seasoning
  • 1 1/2 cups whole milk
  • 1 pound broccoli (chopped)
  • 2 cups chopped leaf spinach
  • 1 pound zucchini (chopped)
  • 1 1/2 cups shredded Cantal cheese (substitute cheddar)
  • 3 tablespoons butter (melted)
  • 1 cup breadcrumbs
  • 1/4 cup Parmesan cheese

Steps to Make It

  1. Preheat the oven to 375 F and butter a large gratin dish.

  2. Gently sauté the onion in the olive oil for five minutes in a medium saucepan set over medium heat. Sprinkle the flour over the onions and continue sautéing the mixture for 30 seconds. Add the salt, pepper, poultry seasoning, and milk to the pan and stir constantly for 3 to 5 minutes until the sauce thickens.

  3. Stir the prepared broccoli, spinach, zucchini, and cheese into the sauce, bring the mixture to just a simmer, and then turn it out into the buttered gratin dish. Stir together the melted butter, bread crumbs, and 1/4 cup Parmesan cheese, and sprinkle the breadcrumbs over the gratin.

  4. Bake the broccoli gratin in the preheated oven for 30 to 40 minutes, until it is hot and bubbly, the vegetable s are tender, and the bread crumbs have turned golden brown.

Recipe Variations

  • You can switch out the vegetables to suit your taste, seasonality, or ​pocketbook. This recipe relies on green vegetables, but there is no reason not to add a few mushrooms, or top it off with a couple of meaty tomato slices. 
  • The cheese in this classic recipe is Cantal. Cantal has a distinctive flavor which works very well with the vegetables. You can switch out the cheese for your own preferences; goat cheese or a crumbly blue cheese also work well.