Preheat your oven to 325°F.
Grease and flour a loaf pan to prevent sticking.
In a bowl, cream together the softened butter and sugar until fluffy.
Add eggs one at a time, mixing well after each addition.
In another bowl, whisk together the flour, baking powder, and salt.
Gradually add the dry ingredients to the wet mixture, and alternate with milk, blending well.
Fold in vanilla extract gently, making sure everything is evenly combined.
Pour the batter into the prepared loaf pan.
Bake for about 1 hour and 30 minutes.
Check with a toothpick inserted in the center; it should come out clean.