Mix the butter, sugar and egg.Add vanilla..Mix the flour, baking powder and salt together.Add this to the butter mixture and mix well.Add the chocolate chips and mix well.Shape dough into rounds and place on an ungreased baking tray at least 1" apart.Press with the base of a glass or any flat tool.Bake in a pre-heated oven at for about 15-20 minutes.Serve or cool and store in an airtight jar.