Preheat the oven to 350°F (180°C). Line a rimmed baking sheet with parchment paper and evenly spread the flour onto the sheet. Bake in the preheated oven for 5-7 minutes, then set aside to cool.
In the bowl of a stand mixer fitted with the paddle attachment, beat together the butter and dark brown sugar until pale, fluffy, and combined, about 2-3 minutes.
Add the vanilla and salt and mix until just combined. With the mixer running on low, gradually add the flour and mix until just incorporated. Set aside approximately two tablespoons of the chopped Butterfinger® and fold the remainder into the cookie dough using a spatula or wooden spoon until combined.
Using a ½-tablespoon spring-loaded scoop, scoop dough and roll into balls, then place on a baking sheet lined with parchment paper. Loosely cover with plastic wrap, and place in the refrigerator to chill for 30 minutes.
Add the chopped semisweet chocolate and canola oil to a large heatproof bowl, then set the bowl over a saucepan filled with just two inches of simmering water over medium heat. Do not let the bottom of the bowl touch the water. Stir until the chocolate is completely melted, then remove from the heat and set aside to cool slightly.
Remove cookie dough balls from the fridge and dip into melted chocolate using a fork or chocolate dipping tool. Place on parchment lined baking sheet, drizzle with additional melted chocolate, if desired, and sprinkle with reserved chopped Butterfinger®.
Refrigerate for at least 15 minutes to allow the chocolate coating to set before enjoying.
Notes
These cookie dough bites will remain fresh in an airtight container in the refrigerator for up to 1 week.