2cupschopped Butterfinger candy bars, about 11-12 snack size bars
Instructions
Preheat the oven to 350 degrees F and line one or two rimmed baking sheets with parchment paper or a silpat liner (or just grease with cooking spray).
In a large bowl or in the bowl of a stand mixer, mix the butter and sugar together until light and fluffy, about 1-2 minutes. Mix in the egg, egg yolk and vanilla.
Stir in the flour, baking soda, salt and Butterfinger pieces.
Scoop the dough into heaping tablespoon-sized balls and space them about 2 inches apart on the prepared baking sheets.
Bake for 8-10 minutes - don't overbake or they will be crispy instead of chewy (unless you want the crispy effect, of course).