Preheat your oven to 350°F (175°C).
Grease and flour a 9x5 inch loaf pan.
In a large bowl, cream the softened butter and sugar together until light and fluffy.
Add the eggs one at a time, mixing well after each addition.
In a separate bowl, whisk together the flour, baking powder, and salt.
Gradually add the dry ingredients to the wet mixture, mixing until just combined.
Stir in the vanilla extract.
Pour the batter into the prepared loaf pan.
Bake for 60 minutes, or until a toothpick inserted in the center comes out clean.
Allow to cool in the pan for 10 minutes, then transfer to a wire rack to cool completely.