Preheat your oven to 350 ° F
Wash the oranges well under water, dry them off and cut them into slices and then into chunks. remove seeds and any bruised pieces.
Put the chopped oranges in the blender or food processor with the blades.
Process well, and then add the oil and milk and blend again.
Add the flour, sugar, baking powder and eggs and blend everything again for a few minutes.
Brush the 9.5" (24 cm) cake pan with a little oil and flour. Also add the strips of wet and squeezed parchment paper along the edge of the pan. Or you can use an oiled springform pan.
Bake in for 50 minutes. Do the toothpick test and adjust with the cooking times of your oven.
Once the orange cake is ready, remove it from the oven and let it cool.
You can decorate it with icing sugar and orange slices or prepare a hot orange glaze, using the orange marmalade heated on a low flame..