In a medium bowl, whisk together cake flour, baking powder, and salt; set aside.
Wet Ingredients
In a large bowl or stand mixer, cream butter and sugar until pale and fluffy.
Add eggs one at a time, beating well after each addition, then stir in vanilla extract.
With mixer on low, add dry ingredients in three additions alternating with milk, beginning and ending with dry mix; mix until just combined.
Divide batter between prepared pans and bake at 350°F for 25–30 minutes until golden and a toothpick comes out clean.
Let cakes rest in pans on a wire rack for 10 minutes, then invert and cool completely before frosting.
Notes
For a smoother crumb, sift the flour twice and fold gently to retain air.Store slices in an airtight container at room temperature for up to 2 days, and bring to room temperature before serving.