Some easy recipes for spinach souffle appear on Mr. Food, AllRecipes.com and the Food Network's website. To make these recipes, you need eggs, spinach, cheese, butter and milk.
To make easy spinach souffle, beat 1 egg, 1/3 cup of milk, 1/3 cup of grated Parmesan cheese, 1 teaspoon of crushed garlic, and salt and pepper to taste in a bowl, and stir in 2 10-ounce packages of thawed and drained frozen chopped spinach. Spoon the mixture into a casserole dish, and cook it at 350 degrees Fahrenheit for 20 minutes.
Make another easy recipe by whipping together 1 cup of heavy cream and 3 eggs and then adding in 2 10-ounce packages of thawed and drained frozen chopped spinach, 1/3 cup of grated Parmesan cheese and 2 tablespoons of all-purpose flour. Season the mixture with 1/2 teaspoon of salt, 1/4 teaspoon of black pepper, 1/8 teaspoon of ground nutmeg and 1/8 teaspoon of ground red pepper. Spoon it into a casserole dish, and bake the souffle at 350 F for 30 to 35 minutes.
Another recipe calls for making basic white sauce by stirring 1/4 cup of all-purpose flour into 1/4 cup of melted butter in a saucepan over medium-high heat and then whisking in 1 cup of milk. Once the sauce comes to a boil, add 1 cup of shredded cheddar cheese and 1 10-ounce package of thawed and drained frozen chopped spinach, and remove the mixture from the heat. In a separate bowl, combine 5 egg whites with 1/2 teaspoon of cream of tarter.
Gradually fold in the egg white mixture and 4 egg yolks into the white sauce, and pour the mixture into a greased baking dish dusted with Parmesan cheese or bread crumbs. Bake the souffle at 350 F for 30 to 40 minutes.