Preheat the oven to 170C/325F/Gas 3. Line a baking tray with a silicone mat. Write fortunes on pieces of paper about 6cm x 1cm/2½in x ½in.
Sift the flour and cornflour into a large bowl then add the sugar and salt and mix well. Using a wooden spoon, stir in the oil, egg whites, water and vanilla and almond extracts.
Place tablespoons of the mixture onto the silicone mat and use the back of a metal spoon to swirl out the mixture into 10cm/4in circles. Leave space between each cookie as they will spread a little during cooking; you will get about five cookies onto the baking tray so will have to cook them in batches. Bake in the oven for 10-12 minutes. The outer edge of each cookie should turn golden brown and the cookies should be easy to remove with a spatula when cooked.
Place a fortune in the centre of each cookie and while the cookie is still soft and pliable, fold it in half and pinch the semi circular edges together to seal. Place the folded edge of the cookie onto the rim of a cup or glass and gently pull the two corners down, one on the inside of the cup and one on the outside, to form the classic fortune cookie shape. Set aside to cool and repeat with the remaining cookies.