Preheat oven to 375 F degrees.

In a small bowl, combine flour, baking soda, and salt and set aside.

With an electric mixer, combine sugar and butter – beat until creamy.

Add in egg and mix until just combined.

Gradually, add in the flour mixture and beat until combined.

Stir in Butterfinger bits by hand. The dough will be very thick.

Drop by slightly rounded tablespoonfuls onto ungreased baking sheet.

Bake for 10-12 minutes or until lightly browned. Allow the cookies to cool on the baking sheet for 5 minutes before transferring to a wire rack to cool completely.

Store cookies in a covered container. The baked cookies also freeze well for up to three months.