Using an electric mixer, beat egg-whites until stiff.
Fold in cheese and flour.
Preheat oven to 160°C.
Pour oil into a saucepan until it is half-full. Heat over medium heat until hot.
Drop heaped teaspoonfuls of cheese mixture into oil, 4 at a time.
Cook for 1 to 2 minutes or until crisp.
Transfer to a wire rack.
Keep warm in oven while cooking remaining cheese puffs.
Serving Size 3 - 5 people