STEP 1/11
Mix the yolk and sugar in a bowl.
STEP 2/11
Add cornstarch and vanilla extract to 1 and mix, then add milk and mix.
STEP 3/11
Microwave for 4-6 minutes.
STEP 4/11
Remove once every 1-2 minutes and stir.
STEP 5/11
Prepare the finished custard cream by cooling it down.
STEP 6/11
Mix butter and sugar in a bowl.
STEP 7/11
Add eggs, mix, and sift in the flour.
STEP 8/11
After clumping the dough, let it rest in the refrigerator for 30 minutes.
STEP 9/11
Push the dough with a rolling pin and dip it into a cookie mold.
STEP 10/11
Bake in an oven preheated to 180 degrees for about 10 minutes.
STEP 11/11
Prepare baked cookies by cooling them, squeeze custard cream on the top of the cookies, and cover them with other cookies to complete.