Preheat the oven on 180 degrees and fill a cupcake tray with paper cases
Add the butter and caster sugar into a mixer and mix until incorporated
Add each egg one at a time until they are both incorporated
Add the flour and bicarbonate of soda and icing sugar into the wet ingredients then mix until incorporated
Using an ice cream scoop, scoop the mixture into each of the cases then bake in the oven for 20 minutes or until golden brown.