Chocolate Rice Cookies

本来是想做英文字母饼，结果太软做不成。
就变成这样了。。。

Ingredients:
1 cup butter
1 cup brown sugar (Must reduce!!!)
2 egg yolks
2 teaspoons vanilla extract

1 cup self-rising flour
1 3/4 cup plain flour
1/2 cup corn flour
10oz chocolate rice

Method:
1. Beat butter, brown sugar, egg yolks and vanilla extract until light and fluffy.
2. Fold in flour mixture, mix well.