Easy Make-Ahead Spinach Gratin
Easy Make-Ahead Spinach Gratin is full of creamy, cheesy goodness. Frozen spinach is mixed with a classic Mornay sauce accented with caramelized onions. It's topped with Gruyère and freshly grated Parmesan for an unforgettable dish.
Ingredients
- 24 ounce Package (680 grams) frozen chopped spinach, thawed
- 2 Tablespoons (1 ounce, 28 grams) unsalted butter
- 2 cups (11.3 ounces, 320 grams) Finely chopped onion (1 large onion)
- 2 Tablespoons all-purpose flour
- 1 teaspoon Kosher salt
- ¼ teaspoon freshly ground black pepper
- ⅛ teaspoon freshly grated nutmeg (See Tip 1)
- 1 ½ cups (12 ounces, 340 grams) milk (See Tip 2)
- ½ cup (2 ounces, 57 grams) freshly grated Parmesan cheese, divided
- ½ cup (2 ounces, 57 grams) shredded Gruyère cheese
Instructions
- Preheat the oven to 425°F. Spray a 2-quart casserole dish with non-stick spray. Set aside.
- By the handful, squeeze as much water as possible from the spinach. Repeat with paper towels. Set aside.
- Melt the butter in a large skillet over medium heat. Add the onions and sauté until lightly browned, about 15 minutes. Add the flour, salt, pepper, and nutmeg. Cook, stirring, for 2 more minutes. Add the milk and cook until thickened. Add ¼ cup of grated Parmesan cheese. Stir until melted. Add the spinach; mix well.
- Transfer the spinach mixture to the prepared casserole dish. Top with Gruyère cheese and the remaining Parmesan cheese. May be prepared in advance up to this point. (See Tip 3)
- Bake in a preheated 425°F oven for about 20 minutes, or until hot and bubbly. (See Tip 4)
- Yield: 6 servings. (See Tip 5)
Video
Tips/Notes
- I like to use fresh nutmeg. However, you can also use ground nutmeg in this dish.
- I used whole milk, but feel free to use 2% milk.
- You can prepare this up to a day in advance. Cover the casserole dish with aluminum foil and refrigerate.
- When baking cold from the refrigerator, add 10–15 minutes to the normal 20-minute bake at 425°F (about 30–35 minutes total), or until hot and bubbly.
- The leftovers are as good, if not better. I usually just heat the leftovers in the microwave for several minutes.
Nutrition
Calories: 201kcalCarbohydrates: 15gProtein: 12gFat: 11gSaturated Fat: 7gCholesterol: 30mgSodium: 651mgPotassium: 565mgFiber: 4gSugar: 6gVitamin A: 13652IUVitamin C: 10mgCalcium: 397mgIron: 2mg
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