01 - Line an 8-inch square baking pan with parchment paper, allowing overhang on opposite sides for easy removal later.
02 - Combine white chocolate chips, sweetened condensed milk, and cubed butter in a medium saucepan. Cook over low heat, stirring constantly until completely melted and smooth.
03 - Remove saucepan from heat. Whisk in heavy cream, Irish cream coffee creamer, vanilla extract, espresso powder, powdered sugar, and salt until mixture is silky and fully incorporated.
04 - Pour mixture into prepared pan, using a spatula to spread evenly and smooth the top surface.
05 - Refrigerate for at least 2 hours or until completely firm throughout.
06 - Lift fudge from pan using parchment overhang. Cut into 36 equal squares. Store in an airtight container in the refrigerator for up to 2 weeks.