Prepare brownies according to box directions and spread in a 9x13 pan lined with nonstick foil.
Electric mix the cream cheese, egg and sugar.
Fold in the Butterfingers.
Drop the cream cheese mix by tablespoons across the brownies.
Use a knife to gently swirl the 2 batters together creating a marbled look.
Top the cream cheese with some extra candies.
Bake according to the brownie box directions.
Cool and chill.
Cut into squares.