This casserole is great made a day in advance. Undercook by a few minutes on the day you prepare the casserole. On the day you reheat it, make sure it is covered, and put it in the oven at 350 - 400 for 45 - 50 minutes.
This recipe is from the November 2008 issue of Real Simple magazine.
Baked Spinach and Gruyere
1 tablespoon olive oil, plus more for the dish
6 shallots, thinly sliced
kosher salt and black pepper
6 large eggs
1 cup heavy cream
1 cup whole milk
1/4 teaspoon grated nutmeg
4 10-ounce boxes frozen leaf spinach, thawed
1/2 cup grated Parmesan (2 ounces)
2 cups grated Gruyere (8 ounces), or Swiss for a milder taste
1 cup dry white wine
Heat oven to 400° F. Coat a shallow 2 1/2- to 3-quart baking dish with oil; set aside.
Heat the oil in a large skillet over medium-high heat. Add the shallots, 1/2 teaspoon salt, and 1/4 teaspoon pepper. Cook, stirring occasionally, until soft, 6 to 8 minutes. Add the wine and simmer until evaporated, 4 to 6 minutes.
Meanwhile, in a large bowl, whisk together the eggs, cream, milk, nutmeg, 1/2 teaspoon salt, and 1⁄4 teaspoon pepper.
Squeeze the spinach to remove excess liquid. Stir the spinach, shallots, Gruyère, and Parmesan into the egg mixture. Transfer to the prepared baking dish.
Bake until bubbling and the top is golden brown, 45 to 55 minutes.
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