Pour the remaining fudge mixture on top and spread it evenly.
Drizzle the remaining caramel sauce and swirl again.
Sprinkle the top with the remaining crushed Butterfinger pieces. If desired, add crushed graham crackers or a pinch of sea salt for garnish.
Step 6: Set and Serve
Refrigerate the pan for at least 3 hours, or until the fudge is fully set.
Once set, lift the fudge out of the pan using the parchment paper overhang.
Cut into squares and serve.