Heat the rice in a frying pan until the rice smells. Using a blender, beat the rice into the flour and sift through a fine sieve. Preheat the oven to 150°C.
Beat room temperature butter with powdered sugar until smooth. Add the yolks one at a time, beating thoroughly each time. Add milk and baking powder, beat again. Add rice and corn flour to the dough and knead quickly.
Gather the dough into a ball and refrigerate for about 2 hours. Before you roll it out, you need to let it sit at room temperature for 10 minutes.
Take some pastry cutters and cut out shapes. Place the cut out pieces on a greased baking sheet and bake for 15 minutes at 180°C.
Sprinkle the top of the rice cookies with powdered sugar or cinnamon. You can also pour melted chocolate over it.