Melt Green Candy Melts in a microwave-safe bowl for 1 minute, stir, and continue microwaving at 50% power until melted and smooth.

Remove from microwave and stir in sweetened condensed milk and creme de menthe until well combined.

Cover the bowl and let the mixture cool until it thickens, stirring every 5 minutes for about 15-20 minutes.

Fill a piping bag fitted with a star tip with the cooled fudge mixture and pipe it into tree shapes on parchment paper.

Immediately sprinkle with rainbow nonpareils and add gold star sprinkles on top of each tree.