Prepare all the ingredients. Grate the cheddar cheese, separate the eggs, and place 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 cheddar cheese into the milky egg yolk mixture.
Add the pesto to the mixture as well.
Whisk the egg whites until stiff peaks form, and gently fold them into the cheese and pesto mixture.
Butter a soufflé dish, then pour in the cheese and pesto mixture.
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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