Preheat oven to 350°F (175°C). Grease or line an 8×8-inch baking dish with parchment.
Mix graham cracker crumbs and melted butter until fully combined.
Press crumb mixture firmly into the bottom of the prepared pan.
Stir together sweetened condensed milk and crushed Butterfingers.
Spread the Butterfinger mixture evenly over the crust.
Sprinkle chocolate chips evenly on top.
Drizzle caramel sauce evenly over the top.
Bake for 25–30 minutes, until edges are golden and center appears set.
Cool completely in the pan before slicing.