Cashew nut cookies

210g butter
100g powder sugar
1 egg yolk
1/2 tsp vanilla essence
250g plain flour
60g corn flour
1/2 tsp baking powder
200g ground cashew nuts
1 egg (beaten for eggwash)
some exra cashew nuts for decoration

1. Pre-heat oven to 350 degree F. Sift all the dry ingredients and set aside.
2. Cream butter with powder sugar until light. Add in egg yolk and vanilla essence. Mix well.
3. Stir in the dry ingredients and ground cashew nuts. Mix well. Chill dough in fridge for 40 minutes.
4. Shape the dough into small balls or roll it out and cut into desire shapes. Arrange on a lined baking tray. Brush with beaten egg and place half cashew nut on top of cookies and press slightly to flatten it.
5. Bake for 15 minutes or until it is nicely brown. Cool and keep in airtight container.