Preheat oven to 350 degrees F (175 degrees C). Lightly grease a 9"x5" loaf pan, then line with parchment paper.
In a large bowl, cream the butter with a mixer on medium-high speed until light and creamy about 1 minute then add the sugar until and whisk until light and fluffy, about 3 minutes.
Reduce the peed of the mixer to medium; beat in the eggs, one at a time, Scrape the bottom and sides of the bowl as needed. Then beat in the vanilla.
In a separate bowl, whisk together the flour, baking powder, and salt.
Alternate the addition of the flour in three batches. Start by folding in half of the flour mixture until just combined (don't overmix). Add the milk and fold until just combined, and finally add the remaining flour and combine until just smooth.
Pour the batter into the prepared baking pan, place it in the oven, and bake for 60 minutes or until a toothpick inserted into the middle of the cake comes out clean.