My Mum used to make these when I was a kid. They are really nommy and super easy to make.
Here's how you make them!
First, preheat your oven to 180 C (160 c for fan-forced)
220 grams of butter
1/3 cup of caster sugar
1 teaspoon Vanilla (essence or extract or whatever is in your cupboard)
1.5 tablespoons of cocoa
1 & 1/2 cups of plain flour
2 & 1/2 cups of Cornflakes (slightly crushed)
Then sift the flour and cocoa together. I always sift things three times, because that's how mum does it. I sifted it twice and then once more straight into the bowl.
When it is pretty much combined, put globs of mixture (these are about 2 teaspoons each) on a tray. Flatten them a bit with your fingers.
Cook them for about 15-20 minutes. Depending on your oven I would even check them after 12 minutes, they burn pretty easily.