Pre-heat the oven to 350F or 180C.
Melt butter in a bowl and keep it to cool.
Mix together all-purpose flour, baking soda, sugar and salt if using unsalted butter.
In another bowl, mix together egg, milk, melted butter and vanilla essence.
Add the liquid ingredients to the flour mix and just fold in the
Pipe the batter in the donut pan and bake for 8 minutes at 350F or 180C.
When baked the donuts will the side of the pan. Don't leave the pan in the oven for long you will get dry donuts.
Cool the donuts once cooled glaze the donuts with Chocolate glaze and decorate with sprinkles.