01 -
Preheat the oven to 350°F and place cupcake liners into two muffin tins.
02 -
Whisk together cake flour, granulated sugar, baking powder, baking soda, and salt in a medium bowl.
03 -
Add buttermilk, milk, vanilla extract, and vegetable oil to the dry mixture and beat using a stand or hand mixer just until combined.
04 -
Whip egg whites in a separate bowl until medium-stiff peaks form, then gently fold into the batter.
05 -
Spoon batter into cupcake liners, filling each about two-thirds full. Bake 20 to 22 minutes until a toothpick inserted in the center comes out clean and tops spring back when pressed.
06 -
In the stand mixer bowl, combine butter, powdered sugar, milk, vanilla extract, and salt. Beat on high speed until the frosting is white and fluffy, approximately 10 to 15 minutes.
07 -
Frost cooled cupcakes as desired with prepared frosting, using seasonal designs for presentation.