Preheat oven to 190ºC. Line an oven tray with baking paper. In a large bowl combine the olive oil, vanilla, eggs, sugar and brown sugar until combined and slightly lighter in colour.
Add the flour, salt, baking soda and rosemary and mix until a dough forms. Fold in the chocolate.
Make soup spoon size balls and place on the tray. You should get 20-24 balls. Bake the cookies for 10-12 minutes until golden. Leave to cool on the tray or wire rack. Store in an air tight container for a week.