Skin walnuts by roasting for 5 minutes, then rubbing off the skins.
In a mixer, break up cold butter for about 30 seconds.
Add caster sugar and soft light brown sugar, mix for 30-45 seconds until forming nuggets.
Add skinned walnuts and milk chocolate, mix to combine.
Add self-raising flour, plain flour, salt, bicarbonate of soda, and baking powder, mix until fine powdery breadcrumbs form.
Whisk 2 large eggs separately, then add to the mixture and combine.
Weigh out 125-gram portions of cookie dough, shape but do not roll into balls.
Freeze cookie dough for 90 minutes.
Place frozen cookie dough on a hot baking sheet, bake for 17 minutes until golden.
Let cookies cool for 5 minutes before enjoying the gooey, half-baked goodness inside with a crispy shell outside.
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