Components:
- * 1/2 cup (1 stick) unsalted butter, room temperature
- * 1 1/2 cup sugar
- * 4 egg white, room temperature
- * 2 tsp vanilla extract
- * 2 cup all motive flour
- * 1 tsp baking powder
- * 1/2 tsp baking soda
- * 1/4 tsp salt
- * 1 1/3 cup buttermilk, room temperature