Prepare all the ingredients: grate the cheese, and finely chop the chili pepper (remove the seeds if you prefer it less spicy).
Crack the eggs into a bowl and whisk them with a fork. Add the milk, salt, and pepper, and mix well.
In another bowl, combine the flour and cornstarch. The cornstarch helps to create a lighter and airier soufflé.
Gradually add the flour mixture to the egg mixture while continuously whisking to prevent lumps from forming. Mix everything well until you have a smooth, creamy batter.
Add the grated cheese and chopped chili pepper, and fold them into the batter.
Choose a suitably sized heatproof dish for baking the soufflé, and grease it with a thin layer of butter or olive oil to prevent the soufflé from sticking.
Pour the batter into the dish, and bake in a preheated oven at 350°F (180°C) for about 25-30 minutes, until the soufflé has risen nicely and the top is golden brown.
When ready, remove from the oven and let it rest for a few minutes before slicing. This will make it easier to slice and help the soufflé retain its shape.
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