Prepare Cupcakes: Preheat oven to 350°F/177°C. Grease and line the muffin tins with cupcake liners.
Sift together in a bowl cake flour, all-purpose flour, baking powder and salt. Set aside.
Cream butter and sugar until light and fluffy. Add eggs to the mixture. Alternately add dry ingredients with milk and vanilla.
Scoop into cupcake liners and bake for 20 to 25 minutes or until done.