I love puto seko. It is sweet and crunchy. Be sure though to have a ready glass or bottle of water whilst eating this puto seko. It tend to make you gasp for breath, I think it is because of its very fine cornstarch content.
Be warned that puto seko may not be for eating and talking at the same time especially for the novice! It is worth it though for the taste.
Below is a recipe I picked up from www.agripinoy.net

Puto Seko Recipe
First Recipe
Ingredients:
1 cup butter, softened
1 cup white sugar
3 eggs
4 cups cornstarch
1 tsp. cream of tartar
1 tsp. baking powder
Here’s how:
Preheat oven to 375degrees F.
Grease the cookie sheets.
In a bowl, cream the butter and the sugar until well-blended and smooth.
Beat the eggs. One egg at a time.
Stir in a cornstarch, cream of tartar and baking powder until well-blended.
Roll the dough into 1-inch balls and place on the cookie sheet.
Bake in the preheated oven for 12 minutes until the puto seco becomes lights brown.
Allow to cool before serving.
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Recipe #2
Ingredients:
300 grams Cornstarch
1 cup flour
1/2 cup butter or margarine
4 eggs
1 tsp. salt
1 tsp. baking powder
1 cup white sugar
Here’s how:
Mix all ingredients together.
Transfer to cookie molds and bake at 300° F oven until golden brown.
Sources: blogcatalog.com, filipinovegetarianrecipe.com & http://www.agripinoy.net/how-to-make-puto-seko