Combine crushed graham crackers, melted butter, and granulated sugar in a mixing bowl. Press the mixture into the bottom of a baking dish to form the crust.
In a saucepan, combine sweetened condensed milk, unsalted butter, brown sugar, light corn syrup, and vanilla extract. Cook over medium heat until the mixture thickens.
Pour the caramel layer over the crust and spread evenly.
Sprinkle chopped Butterfinger candy bars and chocolate chips on top. Optionally add crushed pretzels.
Bake for 20-25 minutes or until the topping is set.
Let cool before cutting into bars.
Notes
Store in an airtight container for up to one week.