Prepare all the ingredients. Chop the walnuts finely, grate the blue cheese, and separate the eggs, placing the egg whites in a clean bowl.
Whisk together the egg yolks with the flour, salt, and a pinch of sugar.
Heat the milk in a saucepan over medium heat until lukewarm, then pour it into the egg yolk mixture.
Stir the blue cheese into the milk and egg yolk mixture.
Mix the chopped walnuts into the batter.
Whisk the egg whites until stiff peaks form, then gently fold them into the cheese and walnut batter.
Butter a soufflé dish, then pour the cheese and walnut batter into it.
Bake in a preheated oven at 350°F (180°C) for 20-25 minutes, or until the soufflé has risen nicely and is golden brown.
Once ready, let it cool slightly, then serve warm.
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