Melt the butter, and allow to cool.Sift the flour and the bicarbonate of soda into a mixing bowl. Add the ground almonds, oats, dried fruit, soft brown sugar, caster sugar and the chocolate chunks and mix well.
Mix the cooled melted butter with the egg yolk and pour into the dry ingredients, stirring to combine.
With your hands, form into walnut-sized balls and arrange slightly apart from each other on 2 baking trays. Using a fork, flatten the biscuits slightly.
Place in the preheated oven and bake for approximately 10 minutes or until golden.
The cookies will still be soft when you take them out of the oven so allow to cool a little on the trays before transferring them to a wire rack to finish cooling.