Preheat your oven to 350°F (175°C) and grease two 9-inch round cake pans.
In a large mixing bowl, cream together the softened butter and sugar until light and fluffy.
Add 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.
Pour the batter evenly into the prepared cake pans.
Bake for 30-35 minutes or until a toothpick comes out clean.
Allow the cakes to cool in the pans for 10 minutes, then transfer to wire racks to cool completely.