01 - Line an 8-inch square baking pan with parchment paper, leaving an overhang on opposite sides for easy removal of the fudge later.
02 - Combine white chocolate chips, sweetened condensed milk, and cubed butter in a medium saucepan over low heat. Stir constantly until completely melted and smooth, ensuring the chocolate doesn't scorch.
03 - Remove the saucepan from heat. Stir in heavy cream, Irish cream coffee creamer, vanilla extract, instant espresso powder, powdered sugar, and salt. Mix thoroughly until the mixture is silky and fully combined.
04 - Pour the mixture into the prepared pan, spreading evenly with a spatula to create a smooth surface. Refrigerate for at least 2 hours until completely firm and set.
05 - Lift the fudge from the pan using the parchment paper overhang. Cut into 36 equal squares. Store in an airtight container in the refrigerator for up to 2 weeks.