1For the donuts, mix yeast with flour and add butter, sugar, salt, and finally the egg and milk.
2Knead by hand or in stand mixer.
3Form a ball, put in a bowl, and let rest in a warm place covered with a cotton cloth for one hour (or until volume doubles).
4Turn on the donut machine.
5Grease hands with a little sunflower oil.
6Take small pieces of dough and form a ball with each one.
7Make a hole in the center with a finger.
8Brush with oil and place these donuts on each machine slot to make donuts.
9The holes should be covered, without letting any dough out.
10Work quickly on second set as the first donuts will be almost ready.
11Once all the holes are filled, close the machine and cook the donuts for 1 minute, or for 2 minutes maximum.
12Place donuts on a rack to cool.
13Prepare remaining donuts, until the dough is used.
14For the powdered sugar icing, mix powdered sugar and water.
15For the dark chocolate frosting, mix the sugar and water.
16Melt chocolate in the microwave oven, stirring every 30 seconds and repeat steps until mixture is smooth and melted.
17Pour the melted chocolate into the mixture of water and sugar and stir until completely blended.
18For the white chocolate frosting, melt the white chocolate in the microwave (just like the dark chocolate frosting) and when it is ready, mix in a tablespoon of milk.
19Dip the donuts one by one into desired frosting, only halfway, and make it turn on itself a bit so that it is well covered.
20If desired, decorate with sprinkles before icing dries.