Preheat the oven to about one hundred and eighty degrees Celsius and prepare a cake pan.
In a large mixing bowl, beat together the sugar and eggs until pale and fluffy.
Slowly add the melted butter, then the milk and vanilla extract, mixing until smooth.
Stir the sourdough starter into the mixture until smooth.
In a separate bowl, mix the flour, baking powder, and salt, then fold into the wet mixture until smooth.
Pour the batter into the prepared cake pan and smooth the top.
Bake for about thirty five to forty minutes, checking for doneness.
Let the cake rest in the pan for about ten minutes before transferring to a plate to cool completely.
Decorate with whipped cream, fresh berries, powdered sugar, or honey as desired.