Add sugar and vanilla extract to the soft butter and use a whisk to mix. It'll take time, but mix until it's fluffy and white.

Once it's become fluffy and white, add the eggs a little at a time. Add, mix, add more and mix again.

After mixing, add the flour. Use a wooden or rubber spatula to mix well. It may look a bit crumbly, but it'll come together.

Once you've mixed it together, add the chocolate (the photo shows two chocolate bars worth). Mix everything together.

Use a large spoon to scoop out onto a baking pan. Don't make them too nice, just drop them down in chunks. That's cuter. See Helpful Hints.

Transfer on a rack, or sieve to cool and they're complete.