Put the washed, dried and cut into pieces orange (with all the skin) in the bowl, chop: 10 sec. speed 5.
Combine at the bottom with the help of a spatula and add the flour, eggs, sugar, oil and milk, mix: 1 min. speed 4.
Add the baking powder, mix: 30 sec. speed 4.
Pour the mixture obtained into a baking dish (22 cm diameter) lined with parchment paper or with a detaching agent for baking sheets.
Bake in a preheated oven at 170°C for about 45 minutes (always do the toothpick test).
Let it cool completely and serve sprinkled with icing sugar as desired... Bon Appetit!
Please use only untreated oranges for this preparation, since they should be blended whole with the skin and those with thin skin should be preferred.