Melt the white chocolate chips using a double boiler.
Add the condensed milk as the chocolate melts (be sure that the bowl is still over the pot of hot water). Stir until the ingredients are combined well.
Pour the chocolate mixture into the prepared pan and even it with a spatula.
Add the green candy melts to a microwave-safe bowl and heat in 30-second intervals, stirring each time, until melted completely.
Drizzle or dollop the green melted candy on top of the white fudge.
Spread it around an offset spatula.
Add the red sprinkles and press them into the fudge gently.