In a bowl, add in your warm milk, yeast and sugar and leave to ferment for a few minutes.

Add in the egg and butter and stir to combine.

Sieve in the flour, cinnamon and salt and stir with the knife to combine.

Prove in a greased bowl until doubled in size.

Divide the doughnuts into 8, shape into a ball and then stick a floured wooden spoon handle through the middle to form the hole in the middle. 

Prove again until doubled in size. Again, stick the floured spoon handle through the hole to make wider and keep the shape.

With a spatula, add your doughnuts to the hot oil. Fry for 30-60 seconds on each side until golden brown. Roll in sugar and cinnamon.