| 1. |
Mix flour, baking powder, cornflour and salt together. |
| 2. |
In another bowl, melt the butter then add the brown sugar and granulated sugar. Mix until there are no lumps. |
| 3. |
Whisk the egg and the egg yolk into the wet mix and then add the vanilla extract. |
| 4. |
Pour the wet ingredients into the dry ones and mix with a large spoon or spatula. The dough will be very soft but thick. |
| 5. |
Fold in the chocolate chips. Cover the dough and chill in the fridge for at least 2 to 3 hours. |
| 6. |
Take the dough out of the fridge and let it soften slightly at room temperature for 10 minutes. |
| 7. |
Preheat oven at 160 degrees for a fan oven. Line baking sheets with greaseproof paper. Roll the dough into tall balls. |
| 8. |
Bake for 12-13 minutes. Leave them on a baking sheet for 10 minutes after taking them out of the oven. Then transfer them to cooling racks and place them into an airtight container when completely cooled. |
