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Preheat oven to 350 F. Line muffin pan with cupcake liners. Depending on how thick they are, use two cupcake liners in each cup.
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In a bowl, combine flour, baking powder, and salt. Set aside.
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In a medium bowl, beat butter and sugar together until light and fluffy, 2-3 minutes.
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Add in egg, egg white, and vanilla; beat until blended.
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On low speed, gradually beat in flour mixture, one third at a time, alternating with milk, beginning and ending with flour.
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Divide batter among liners and bake for 18-20 minutes or until a toothpick inserted in the center comes out clean. Cool 10 minutes in the pan. Transfer to a wire rack to cool completely.
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Once cupcakes are cooled completely, use an apple corer to cut a hole in the center of each cupcake. Press down the cake inside the hole. Set aside until ready to frost.