Microwave the margarine until it's mostly melted, add sugar and salt, and mix well. Continue by adding the egg yolk and mixing.
Sift in cake flour, and mix until the flouriness disappears while pressing down with a rubber spatula. It is OK once it has crumbled like the photo.
Place into a plastic bag and squeeze together, and then shape into a tube.
Wrap it up into a neat tube while rolling it around in the plastic bag (about 2.5-3 cm in diameter).
Remove from the plastic bag and cut about 5 mm thick, and line up on a cookie sheet. Press down firmly in the center with your thumb.
Place into an oven preheated to 340°F/170°C, bake for about 19-20 minutes, and it is done. These are crunchy once cooled. Adjust the baking time according to the oven.
I used "CAFE703's" "You Can Make These Right Away! Salt Cookies" Recipe ID: 732837 as reference for pressing down firmly with a finger molding technique.
To make the buttons as shown in the photo, poke with the blunt end of a toothpick halfway through the dough after transferring to the cookie sheet before baking.
Story Behind this Recipe
If I eat any more, then I will no longer be as to fit into the suit I wear for graduations and opening ceremonies. I want to make and eat them so much, it makes me want to scream... I made delicious salt cookies that are just barely healthy. These are also satisfying, so even just a little should be enough.
*This is an important healthy recipe to me no matter what. *1 tablespoon of butter or margarine has the same amount of calories. I thought vegetable oil has fewer calories, but oil actually has more.