This classic spinach dish is so delicious, even the kids will love it this Thanksgiving! Have you downloaded the new Food Network Kitchen app yet? With up to 25 interactive LIVE classes every week and over 80,000 recipes from your favorite chefs, it's a kitchen game-changer. Download it today: http://food-network.app.link/downloadSubscribe to Food Network: https://foodtv.com/2WXIIWZGet the recipe: https://www.foodnetwork.com/recipes/ina-garten/spinach-gratin-recipe-1940406Spinach GratinRECIPE COURTESY OF INA GARTENLevel: EasyTotal: 1 hr 35 minPrep: 10 minInactive: 45 minCook: 40 minYield: 8 servingsIngredients4 tablespoons (1/2 stick) unsalted butter4 cups chopped yellow onions (2 large)1/4 cup flour1/4 teaspoon grated nutmeg1 cup heavy cream2 cups milk3 pounds frozen chopped spinach, defrosted (5 (10-ounce) packages)1 cup freshly grated Parmesan cheese1 tablespoon kosher salt1/2 teaspoon freshly ground black pepper1/2 cup grated Gruyere cheeseDirectionsPreheat the oven to 425 degrees F. Melt the butter in a heavy-bottomed saute pan over medium heat. Add the onions and saute until translucent, about 15 minutes. Add the flour and nutmeg and cook, stirring, for 2 more minutes. Add the cream and milk and cook until thickened. Squeeze as much liquid as possible from the spinach and add the spinach to the sauce. Add 1/2 cup of the Parmesan cheese and mix well. Season, to taste, with salt and pepper. Transfer the spinach to a baking dish and sprinkle the remaining 1/2 cup Parmesan and the Gruyere on top. Bake for 20 minutes until hot and bubbly. Serve hot.Note: This recipe has been updated and may differ from what was originally broadcast or published.Subscribe to our channel to fill up on the latest must-eat recipes, brilliant kitchen hacks and content from your favorite Food Network shows. Watch free FULL EPISODES of Food Network shows: http://www.foodnetwork.com/videos/full-episodes?soc=youtubeVisit Food Network online: http://www.foodnetwork.comLike Food Network on Facebook: https://www.facebook.com/FoodNetworkFollow Food Network on Twitter: https://twitter.com/FoodNetworkFollow Food Network on Instagram: https://www.instagram.com/foodnetwork/