01 - Line an 8-inch square baking pan with parchment paper, leaving an overhang on two sides for easy removal.
02 - Combine the diced strawberries, granulated sugar, and lemon juice in a small saucepan. Simmer over medium heat for 5 to 7 minutes, stirring occasionally, until the berries break down and the mixture thickens slightly. Set aside to cool completely.
03 - Place the chopped white chocolate, sweetened condensed milk, and unsalted butter in a microwave-safe bowl. Microwave in 30-second intervals, stirring thoroughly between each interval, until the mixture is completely melted and smooth.
04 - Stir the pure vanilla extract into the melted fudge base until evenly incorporated.
05 - Pour the fudge mixture into the prepared baking pan and smooth the top with a spatula into an even layer.
06 - Beat together the softened cream cheese, powdered sugar, and heavy cream in a small bowl until smooth and creamy.
07 - Spoon dollops of the cooled strawberry compote and cream cheese mixture over the fudge layer. Use a toothpick or knife to gently swirl them together, creating a marbled effect throughout the surface.
08 - Refrigerate the fudge for at least 2 hours, or until completely firm and set.
09 - Lift the fudge from the pan using the parchment paper overhang. Cut into 16 even squares and serve chilled.