Creamy Gruyere Baked Zucchini Squash Gratin

3.74 from 38 votes

Creamy Gruyere Baked Zucchini Squash Gratin

Prep Time15

Cook Time20

Total Time35

Course: 200+ Easy Side Dish Recipes Every Mom Needs

Keyword: best summer recipes, gruyere, side dish, side dishes, summer recipes, thanksgiving, thanksgiving sides, vegetable, vegetables, zucchini

Servings:

Author: Sweet Basil

Ingredients

4 Tablespoons Unsalted Butter melted and divided
2 Tablespoons Olive Oil
2 Zucchini sliced thin (we use a mandolin)
2 Yellow Squash sliced thin
1 Shallot sliced thin
4 Cloves Garlic minced
2 Cups Spinach packed into the measuring cup or see note
1 Tablespoon Fresh Thyme
1/4 Cup Fresh Parsley chopped
1/2 teaspoon Ground Nutmeg
2 teaspoons Salt
1 teaspoon Pepper
1 Tablespoon Lemon Juice
4 Large Eggs
3/4 Cup Heavy Cream whole milk or half and half work if needed
1/3 Cup Parmesan Cheese freshly grated, divided
3/4 Cup Gruyere Cheese grated

US Customary - Metric

Instructions

Preheat the oven to 350 degrees F.
Heat 2 tablespoons of butter and 2 tablespoons olive oil in a large (12-inch) cast iron skillet (see note) over medium-high heat. Add the zucchini, squash and shallots and sauté for 2 minutes.
2 Tablespoons Olive Oil, 2 Zucchini, 2 Yellow Squash, 1 Shallot, 4 Tablespoons Unsalted Butter
Add the garlic to the pan while stirring with a wooden spoon and cook for one minute.
4 Cloves Garlic
Add the spinach to the pan and stir until wilted and then stir in the thyme, parsley, nutmeg, lemon juice, salt, and pepper and toss well. (Transfer to the buttered baking dish if you aren't using a cast iron skillet now)
2 Cups Spinach, 1 Tablespoon Fresh Thyme, 1/4 Cup Fresh Parsley, 1/2 teaspoon Ground Nutmeg, 2 teaspoons Salt, 1 Tablespoon Lemon Juice, 1 teaspoon Pepper
In a medium bowl, whisk together the eggs, cream, remaining 2 tablespoons melted butter, and the 1/4 cup Parmesan cheese. Pour the mixture all over the spinach and zucchini, then sprinkle with Gruyere.
4 Tablespoons Unsalted Butter, 4 Large Eggs, 3/4 Cup Heavy Cream, 1/3 Cup Parmesan Cheese, 3/4 Cup Gruyere Cheese
Bake for 20 to 30 minutes, until a knife inserted in the center comes out clean. Sprinkle with reserved parmesan and serve!
1/3 Cup Parmesan Cheese

Notes

If you don't have a cast iron skillet, butter a 10-12" baking dish with 2 tablespoons of the melted butter and set aside. You will transfer the vegetables to the baking dish before baking.

Frozen spinach works great if you need to use it.

Nutrition