Preheat your oven to 350°F (175°C). Grease and flour two 9-inch round cake pans.
In a large bowl, cream together the softened butter and sugar.
Add the eggs one at a time, mixing well after each addition.
Stir in the vanilla extract.
In another bowl, whisk together the flour, baking powder, and salt.
Gradually add the dry ingredients to the wet mixture, alternating with milk.
Mix until the batter is smooth and well combined.
Pour the batter evenly into the prepared pans.
Bake for 30-35 minutes, or until a toothpick comes out clean.
Allow cakes to cool in pans for 10 minutes before transferring to wire racks.