Reading the whole post helps to nail this easy recipe. I have given all the alternates which you might like to question.
Finally, the first batch of cookies takes more time ( 15 minutes) to bake. The second and third batch takes only 12 to 13 minutes to bake. So have an eye while baking. And, also every oven behaves differently, so adjust time and heat according to it.
Keyword custard cookies, custard sandwich cookies, custard powder cookies, vanilla custard cookies