01 - 
                Line an 20x20 cm (8x8 inch) square baking dish with parchment paper. Lightly coat the parchment with nonstick cooking spray and set aside.
              
              
              
                02 - 
                In a medium saucepan over medium-high heat, combine salted butter, marshmallow crème, sweetened condensed milk, granulated sugar, and caramel syrup. Stir constantly until the mixture begins to boil.
              
              
              
                03 - 
                Once boiling, continue stirring for 4 minutes as the mixture turns golden-brown and thickens. Stir in butterscotch chips until melted and smooth. Remove from heat and whisk for an additional 1-2 minutes until slightly thickened but still pourable.
              
              
              
                04 - 
                Pour the butterbeer mixture into the prepared baking dish, spreading to the edges. Place in the freezer to chill while preparing the next layer.
              
              
              
                05 - 
                In a separate saucepan over medium heat, combine granulated sugar, salted butter, marshmallow crème, and sweetened condensed milk. Stir continuously until the mixture starts to boil.
              
              
              
                06 - 
                Once boiling, reduce heat to medium and stir for 2 minutes. Remove pan from heat and immediately add white chocolate chips, stirring gently until melted. Avoid overstirring to prevent seizing.
              
              
              
                07 - 
                Quickly pour the melted white chocolate layer over the chilled butterscotch base. Gently use a spatula to spread evenly to the edges.
              
              
              
                08 - 
                Place the dish in the refrigerator for 2-3 hours or freezer for 1 hour until completely chilled and firm.
              
              
              
                09 - 
                Once fully set, remove fudge from the dish and slice into 49 2.5 cm (1-inch) cubes. Serve immediately.