List of ingredients...
Melt the butter and allow to cool so that it is just warm.
In a medium bowl, sift the flour, baking soda and salt and mix through (see Notes). Also, add and mix through the oats.
In a large bowl, whisk or beat the butter and sugar until it is well blended but do not over beat.
Add the egg, extra yolk and vanilla paste to the sugar/butter mixture and whisk or beat until well combined.
Add the flour, baking soda and salt mixture into the wet mixture and mix with a rubber spatula until just combined (see Notes).
Mix through the chocolate chunks/chips.
At this point, the mixture may be slightly wet. Put in fridge to chill for 30 min.
Remove cookie dough from fridge and form balls (80 g) of the cookie mixture and fridge for 5 min (see Notes).
With each ball, using your finger tips, break in half and join at the bottom so that the top looks jagged. You're still forming a single, slightly flattened ball but the top is jagged. Refer to video for visual instruction. This technique produces a textured cookie top rather than a flat one.
Place these in the fridge for 30-60 min. The colder they are, the less they will spread when baking. You can also freeze these for up to 3 months (see Notes).
Preheat fan-forced oven to 160°C. Position the oven rack in the middle of the oven.
Place the cookie balls on a baking tray lined with baking paper and space them at least 5 cm apart. Best to bake in two batches.
Bake for 15 - 18 min (see Notes).
Remove from oven and let them cool while on baking tray and paper.
Store in air tight container once completely cooled.