Put butter in a heat resistant bowl. Cover with plastic film, and microwave to melt the butter completely. Add sugar and mix.
Sift in flour, and bring the dough into one clump.
Divide the dough into about 20 balls. Placeon a baking sheet lined with parchment paper.
Bake in a preheated oven at 340F/170C for 15 - 20 minutes. (Check the dough after baking for about 15 minutes. Bake until lightly browned. ) Let them cool down completely, and dust with powdered sugar.
To make a chocolate version: Sift in the cake flour and 2 tablespoons of pure cocoa powder together at Step 2.(You don't need to reduce the cake flour.)
Story Behind this Recipe
I made an easier version of a recipe I found in a recipe book I read a long time ago.
The cookies are delicious if you add 40 g chopped walnuts at Step 2. It's easy to coat the cookies with powdered sugar if you put the cookies and sugar in a plastic bag and shake. Adjust baking time depending on your oven. Both salted and unsalted butter are good for this.