Sift together the flour, baking powder and salt. Set aside.
In a medium bowl cream together the butter, brown sugar and white sugar until smooth. Beat in the egg and vanilla. Gradually stir in the sifted ingredients then stir in the chocolate chips. Drop by rounded tablespoonfuls onto ungreased baking trays.
Bake for 8 to 10 minutes in preheated oven. Allow biscuits to cool on baking tray for 5 minutes before transferring to a wire cake rack to cool completely.