Chocolate Marble cookies

I rarely bake a large batch of cookies ^^", well because most of the time, I just bake because I want to try the recipe or just want to eat a bit of it.

This time, my niece wanted me to bake for her classmates and teachers, and it meant I needed to bake a lot of something for her. I choose to make a cookie, as it's easy and yes, you can make a load of it in no time. A soft cookie was not suitable for a child to pack to school (as it will be crushed easily), and a butter cookie is a right answer for me.
But only plain and simple butter cookie was not what I wanted, something cute and full of flavor was more interesting. 
So, I baked chocolate marble cookie for her, this recipe gives you 60-65 pieces of the cookie (a lot, haha) but you can bake an only half batch of the cookie, and keep the unbaked dough fully covered in the freezer for a month. This type of icebox cookie is very convenient, as you can prepare it before time and bake it whenever you want.

Recipe: Chocolate Marble cookies
สูตรภาษาไทย: ช็อกโกแลตมาร์เบิ้ล คุกกี้
日本語のレシピ：チョコレートマーブルクッキー
Youtube: ช็อกโกแลตมาร์เบิ้ล คุกกี้, Chocolate Marble cookies, チョコレートマーブルクッキー

Chocolate Marble Cookies

Makes 60-65 pieces 

230 g ...................... Unsalted butter (Soft)
1/2 tsp .................... Salt
1/2 tsp .................... Vanilla extract
270 g ...................... Granulated sugar
2 ............................. Eggs
1 ............................. Egg yolk
490 g ...................... All-purpose flour
45 g ........................ Cocoa powder
20 g ........................ Corn starch
30 g ........................ Whipping cream

 Beat the butter until smooth.
Add the salt, vanilla, and sugar, and beat until fully combine and lighter in color.
Add the eggs and egg yolk, and beat until combine.

 Pour the flour into the bowl.

 Fold until combine and divide into 2 equal parts.

 Sift cocoa powder and corn starch into half of the dough, pour the whipping cream into the bowl.

 Mix together.

 Until fully combine.

  Roll both of the dough together.

Cut in half.

Roll each half into a cylinder.   
The size is about 4 cm in diameter and 25 cm long.

 Cover with baking paper.
Freeze at least 2 hours before using it.
*Can be kept fully covered for 1 month in the freezer.

 Preheat an oven to 180C
Line baking sheet with baking paper.
Cut the dough into 8mm thickness.

 Place on the prepared baking sheets.
Bake for 15-20 minutes.

Remove from the oven, and let them cool on a wire rack.

Chocolate Marble Cookies