A very delicious childrens favourite and the adults won't even leave it!!
Preheat oven to 180°. Grease and line two oven trays with baking paper.
Beat butter, sugar, egg yolk and combine with coffee granules and hot water in a small bowl with electric mixer until smooth. Transfer mixture to a large bowl.
Add flour and cocoa together and knead the dough on a floured surface until smooth.
Roll table spoon level of mixture into balls and press a little chocolate melt in to the center of each cookie. Bake for about 12 minutes. Cool cookies on trays.
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