The modern way to make Butter cake is by separating the egg white and egg yolk, in a bowl mix the butter, egg yolk and sugar together and beat until fluffy to incorporate air into the butter, beat the egg whites to soft peaks before folding into the mix and gently folding in flour a little at a time.Finally pour into a cake tin lined with parchment paper. Pre-heat the oven to 160 degrees Celsius or (320 °F) (Depending on your type of oven baking time will vary)