Line a square (8-x-8” or 9-x-9”) baking pan with parchment paper then grease with cooking spray. Line the bottom of the pan with graham cracker squares so that the entire bottom of the pan is covered, trimming graham crackers if necessary

In a small saucepan over medium heat, combine white chocolate chips, sweetened condensed milk, butter, vanilla, and salt. Cook, stirring often, until melted and smooth

Reduce heat to medium-low and add pudding mix; stir until completely dissolved

Turn off heat and add marshmallow fluff. Stir until melted. Pour mixture over graham crackers

Refrigerate until set, about 3 hours. Cut into small squares and enjoy your luxurious Cheesecake Fudge