Custard Cookies with Strawberry Jam

Ingredients:
300g Butter
140g Icing sugar
2       Egg Yolk
1tsp  Vanilla essence

Mix and sift the dry ingredient well :
240g Flour
100g Corn flour
160g Custard powder

120g Strawberry Jam

Method:
1) Mix the butter and icing sugar for about 1-2 minutes.
2) Add-in egg yolk 1 at a time, vanilla essence then mix for
    another 2 minutes.
3) Lastly, add-in the dry ingredients and continue
    mix with low speed till combined. It well become a very soft dough.
4) Rest for about 20 minutes before mould it.
5) Drop a little jam in the center of the cookies.
6) Bake for 23 minutes at 160 degree Celsius in the middle of the oven.

NOTES:
If prefer to have a crunchy cookies texture, bake for 25 minutes instead.

Yield : 3 small rounded transparent containers
Time : 2 hours
Cost : RM8/ container