Preheat your oven to 350°F (175°C).
Cream together the softened butter, light brown sugar, and granulated sugar until smooth and fluffy.
Beat in the eggs one at a time along with the vanilla extract; mix well.
In another bowl, whisk together the flour, baking soda, and salt before gradually adding it to the wet ingredients.
Gently fold in the crushed Butterfinger candy bars, caramel bits, and chopped peanuts until evenly distributed.
Scoop tablespoon-sized portions of dough onto lined baking sheets and sprinkle sea salt flakes on top. Bake for about 10-12 minutes until edges are golden.