Grate the oil on a coarse grater. Mix with sifted flour and powdered sugar. It should be a small crumb.
Add egg yolks, beaten until smooth with salt and vanilla bean seeds. Quickly knead into a smooth dough. Form a ball, wrap in cling film. Place in refrigerator for at least 30 minutes.
Take the dough out of the refrigerator. Roll it out on the table into a layer 1 cm thick. Cut out circles with medium molds and transfer to a baking sheet covered with baking paper.
Bake in the oven at 180°C for 15-20 minutes, depending on size. Remove the baking sheet from the oven and cool to room temperature. Transfer to a dish and sprinkle with powdered sugar.