Preheat the oven to 350°F (175°C). Grease and flour your cake pans or line them with parchment paper.
In a medium bowl, whisk together the flour, baking powder, and salt. Set aside.
In a large bowl, cream together the butter and sugar using an electric mixer until light and fluffy (about 3-4 minutes).
Add the eggs, one at a time, mixing well after each addition. Stir in the vanilla extract.
Gradually add the dry ingredients to the butter mixture, alternating with the buttermilk. Begin and end with the dry ingredients. Mix until just combined.
Pour the batter evenly into the prepared cake pans.
Bake for 25-30 minutes, or until a toothpick inserted into the center comes out clean. (If making a larger or multi-layer cake, adjust baking times accordingly.)
Allow the cakes to cool in the pans for 10 minutes, then transfer to wire racks to cool completely.