2) Add the peanut butter, vanilla and egg, and blend well. Add the flour, bicarbonate of soda and salt and mix well to make a dough mixture. With a wooden spoon or rubber spatula, stir in butterscotch chips.
3) Take small dollops of dough and shape, with your hands, into 2.5cm balls. Place 5cm apart on prepared baking sheets; make sure that the biscuits are at least 5cm away from each other because they will spread.
4) Dip a fork into the sugar and flatten the balls lightly in a crisscross pattern, dipping into the sugar again regularly. Bake the biscuits for 6 to 9 minutes, or until golden brown.
5) Remove the biscuits from the baking sheet immediately and place on wire racks to cool thoroughly. After the biscuits have cooled, dip in the chocolate sauce.