Moist Vanilla Cake

Directions

1. 1
   ["Preheat oven to 165F Celsius.", "In a bowl, cream together butter and sugar until light and fluffy.", "Add in egg yolk and vanilla, mixing until fully incorporated and set aside.", "In a separate bowl, combine flour and baking powder.", "Gradually add dry ingredients to the butter mixture, alternating with buttermilk.", "(a little buttermilk-mix-a little flour-mix-repeat) Mix until batter is fluffy, but don't overmix!", "(substitute buttermilk by adding half a tablespoon of lemon juice or vinegar to half a cup of milk and keep it aside for 10 minutes or till it curdles)", "Beat egg whites until cloudy and thick (firm peaks).", "Very gently fold whites into the batter and mix just until incorporated.", "Pour the batter into a greased and lightly floured/ baking paper lined tin.", "I used a 6.5 x 2.5 \" springform tin.""