With the globe attachment whisk the butter in a bowl until it's creamy
Add the sugar and mix until the sugar is fully dissolved
Add the eggs and continue mixing
Change to the beater attachment, add the walnuts and keep mixing
Sift the dry ingredients (flour, maizena, baking powder, salt) into the bowl and continue mixing
optional: chill the dough in the fridge for a few hours to solidify the fat in the cookies. Like that they keep the shape better when baked. The dough can be chilled as a whole or already rolled into small balls on a tray
Preheat the oven to 180°C or 350°F
Form the dough into small balls (gumball size)
bake the cookies for 8 to 12 min
place the cookies on a cooling rack for about 5 to 10min
roll each cookie in the confectioners sugar so they become a nice white coating