Preheat the oven to 350°F (175°C).
Grease and flour two 9-inch round cake pans.
In a bowl, cream together the butter and sugar until light and fluffy.
Add the eggs one at a time, mixing well after each addition.
Stir in the vanilla extract.
In another bowl, combine flour, baking powder, and salt.
Gradually add the dry ingredients to the wet mixture, alternating with milk.
Mix until just combined; do not overmix.
Divide the batter evenly between the prepared pans.
Bake for 30-35 minutes or until a toothpick inserted in the center comes out clean.