Step by step

Bake at 180°C for 35 minutes and decorate as you wish

Tips
The smaller the diameter of your doughnut, the easier it will be to make and, in particular, to move from the work surface to the baking tin.
Trivia
The sweet yeast bread, or 'brioche', is an entirely French 'invention'. It's good both without any filling, or with confectioner's custard or jam.