Add the butter and sugar into a large bowl and blend together with a hand mixer until combined. Add the eggs and blend until combined.
Sift together the flour, baking soda, and salt. Add this mixture to the wet mixture and mix with the hand mixer until just combined, scrape down the sides of the bowl if necessary with a spatula.
Cut the butterfingers up into small pieces and add to the cookie batter, fold them into the batter by hand with a spatula.
Drop the dough onto a baking sheet, I used a small scoop for this. Bake the cookies 12 at a time for 12-14 minutes or until they are lightly browned. Let cool on rack for 5 minutes before transferring to a cooling rack.
Recipe values are approximate. If you require a special diet, please use your own calculations. Values below are for 1/24 of the recipe.