Preheat oven to 375 degrees.  Line muffin pan with 18 cupcake liners.  Combine flour, baking powder and salt in a bowl, set aside.  In a mixer, beat butter for 30 seconds or until light a fluffy.  Add sugar and vanilla, beat until well combined.  Add eggs, one at a time.  Beat one minute after eggs have been added.  Add the flour mixture alternately with the milk, beat batter until fluffy and smooth.  Divide dough between the cupcake liners.  Bake 18 - 20 minutes.  Cool on a wire rack.