Preheat oven to 350°F. Grease and flour a 9x5-inch loaf pan.
Beat butter and sugar together until light and fluffy, about 3-4 minutes.
Add eggs one at a time, mixing well after each addition. Stir in vanilla.
In a separate bowl, whisk together flour and salt.
Add the flour mixture and milk alternately, beginning and ending with the flour mixture.
Pour batter into the prepared loaf pan.
Bake for 55-65 minutes, or until a toothpick inserted into the center comes out clean.
Cool completely before cutting into cubes.