Milkway cookies

My friend, Sonia, shared this recipe with me. It is popular during the Chinese New Year season.

Ingredients:
100 grams rolled oats
125 grams corn flour
250 grams all-purpose flour
225 grams fine granulated sugar
2 tablespoons custard powder
2 tablespoons cocoa powder
250 grams butter
2 egg yolks
1 tsp vanilla essence
milk powder & icing sugar (3 parts milk powder : 1 part sugar)(I made do without this because I did not have any milk powder in the pantry and it was snowing outside so a trip to the grocery store was just too much trouble)

Sift the dry ingredients together.
Cream butter and sugar until light and fluffy.
Add in vanilla essence and egg yolks. Mix well.
Add in oats and flour and form into a dough.
Roll dough out to about 1/4 inch thick. Cut with cookie cutter.
Bake in 350F for about 10-15 minutes.
Lightly dust with powdered sugar and milk powder when cookie is cooled to room temperature.