Beat the icing sugar and butter together until fluffy and then add the egg yolk
Sift in the flour and salt and knead to form a dough
Chill in the fridge for 20 minutes
Preheat the oven to 190C/375F/Gas 5
Roll out the dough to about 6mm thick and cut out rounds with a cookie cutter
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Place on a baking sheet and bake for 12-14 minutes until they start to brown around the edges
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Leave to cool completely – preferably overnight
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Make the icing by mixing the icing sugar with about 15ml water – add water a tiny bit at a time until you get a good consistency that will coat the back of a spoon
Seperate the icing into three and colour two lots blue and black
Start decorating the cookies with the blue first – drawing on horns and the outline of the yeti mouths
Add black to the inside of the yeti mouths, drawing teeth shapes
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Fill in the teeth with white and then draw an ‘furry’ outline around the cookies in white before filling the rest in with white
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Before the icing sets, stick eyes on to finish the cookies off.