Preheat the oven to 350°F (175°C). Grease and flour a loaf pan.

In a mixing bowl, cream together the softened butter and sugar until light and fluffy.

Add the eggs one at a time, mixing well after each addition.

In a separate bowl, combine the flour, baking powder, and salt.

Gradually add the dry ingredients to the butter mixture, alternating with the milk. Mix until just combined.

Stir in the vanilla extract.

Pour the batter into the prepared loaf pan and smooth the top.

Bake for 60-70 minutes, or until a toothpick inserted into the center comes out clean.

Let the cake cool in the pan for 10 minutes, then transfer to a wire rack to cool completely.