Ensure the butter is softened / at room temperature, beat butter,and sugar together until as white as possible
Add egg and vanilla, beat until well combined
Add flour, I then beat the dough with my head held electric beater on low, but, you can beat it with a wooden spoon if you prefer
Once it has come together as a dough, stir through the raisins
In a medium bowl roughly crush the cornflakes
Take large spoonfuls of the cookie dough and roll into a ball, To do this I use a large tablespoon, ie the 20ml Australian tablespoon (kiwi tablespoons are only 15ml)
press the ball into the crushed cornflakes, you want to flatten the ball when doing this into a cookie shape
Place onto a lined baking tray
Do this until you have used all the dough, I usually get 20 cookies
Bake for 12-15 minutes, the cookies are usually still soft at this point, they firm up when they cool
Enjoy!
Notes
You can totally swap the raisins for chocolate chips or leave them out altogether
You could sub the egg for 3 tablespoon of condensed milk
You can always make cornflake cookies out of any cookie dough you like, my condensed milk chocolate chip cookies would be yum with a cornflake crumb