01 -
Preheat the oven to 350°F and line two muffin tins with cupcake liners.
02 -
In a medium bowl, whisk together cake flour, granulated sugar, baking powder, baking soda, and salt until evenly mixed.
03 -
Add buttermilk, milk, vanilla extract, and vegetable oil to the dry mixture. Beat with a stand or hand mixer just until fully combined.
04 -
In a separate bowl, whip egg whites to medium-stiff peaks. Gently fold the egg whites into the batter to maintain lightness.
05 -
Scoop batter into cupcake liners, filling each about two-thirds full. Bake for 20 to 22 minutes, or until a toothpick inserted in the center comes out clean and the tops spring back when lightly pressed.
06 -
Combine butter, powdered sugar, milk, vanilla extract, and salt in a stand mixer bowl. Beat on high speed until frosting is white and fluffy, about 10 to 15 minutes.
07 -
Once cupcakes have cooled, frost as desired using prepared frosting.