Squash Gratin with Mornay Sauce

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Use up in-season squash with this quick gratin. It’s topped with a creamy Mornay sauce, a classic bèchamel plus Gruyère cheese.

By Virginia Willis
Published on August 10, 2024
Squash Gratin with Mornay Sauce in a baking dish
Prep Time:
15 mins
Cook Time:
15 mins
Total Time:
30 mins
Servings:
4
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Ingredients

Original recipe (1X) yields 4 servings

  • 1/2 cup water

  • 3/4 cup thinly sliced Vidalia onion

  • 8 ounces zucchini, sliced 1/4-inch thick 

  • 8 ounces yellow squash, sliced 1/4-inch thick 

  • 1 1/2 teaspoons chopped fresh oregano

  • 1/2 teaspoon salt, divided

  • 1 tablespoon olive oil

  • 1 tablespoon all-purpose flour

  • 1/8 teaspoon freshly ground black pepper

  • 2/3 cup whole milk

  • 1/2 cup shredded Gruyere cheese

Directions

  1. Set oven rack 6 inches from heat source; preheat broiler. Bring water to a boil in a large skillet; add onion, zucchini, and yellow squash. Reduce heat; simmer, covered, until tender, 7 to 9 minutes. Drain. Transfer to a 1-quart baking dish. Sprinkle with oregano and 1/4 teaspoon salt. 

  2. In a small saucepan, heat oil over medium heat. Whisk in flour, pepper, and remaining 1/4 teaspoon salt; cook until foaming, then whisk in milk until thickened, about 2 minutes. Stir in Gruyère cheese until melted; pour over vegetable mixture.

  3. Broil until browned, about 2 minutes. Sprinkle with more oregano and pepper.

Nutrition Facts (per serving)

150 Calories
10g Fat
10g Carbs
7g Protein
Nutrition Facts
Servings Per Recipe 4
Calories 150
% Daily Value *
Total Fat 10g 12%
Saturated Fat 4g 20%
Cholesterol 20mg 7%
Sodium 389mg 17%
Total Carbohydrate 10g 4%
Dietary Fiber 2g 6%
Total Sugars 6g
Protein 7g 14%
Vitamin C 12mg 14%
Calcium 223mg 17%
Iron 1mg 4%
Potassium 364mg 8%

* Percent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.

** Nutrient information is not available for all ingredients. Amount is based on available nutrient data.

(-) Information is not currently available for this nutrient. If you are following a medically restrictive diet, please consult your doctor or registered dietitian before preparing this recipe for personal consumption.