Prepare all the ingredients. Grate the Parmesan cheese, separate the eggs, and place the egg whites in a clean bowl.
In a separate bowl, whisk together the egg yolks, flour, salt, and a pinch of sugar.
Heat the milk in a saucepan over medium heat until lukewarm. Then, gradually pour it into the egg yolk mixture, whisking constantly to prevent lumps.
Stir the grated Parmesan cheese into the milk and egg yolk mixture.
Whisk the egg whites until stiff peaks form. Gently fold the beaten egg whites into the cheese mixture in two or three additions, being careful not to deflate the whites.
Butter a soufflé dish and pour the cheese mixture into it.
Bake in a preheated oven at 350°F (180°C) for 20-25 minutes, or until the soufflé has risen and is golden brown.
Once done, let it cool slightly before serving warm.
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