Prepare all the ingredients: grate the mozzarella and Parmesan cheese, chop the thyme, and set aside.
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 make the soufflé lighter.
Gradually add the flour mixture to the egg mixture, whisking constantly to avoid lumps. Mix well until you have a smooth, creamy consistency.
Add the grated mozzarella cheese, Parmesan cheese, and chopped thyme, then mix thoroughly.
For baking the soufflé, choose a suitably sized oven-safe dish and grease it with a thin layer of butter or olive oil to prevent the soufflé from sticking.
Pour the mixture 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 it's ready, remove it from the oven and let it rest for a few minutes before slicing. This makes it easier to slice, and the soufflé will hold its shape better.
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