Add milk, heavy cream, sweetened condensed milk, white chocolate and mint extract into the bowl of a slow cooker or Instant Pot.

Set the slow cooker to low and cook for two hours, stirring every 15-20 minutes to combine the ingredients and incorporate the chocolate chips as they melt.

(optional) Once the chocolate chips are fully melted, add green food coloring and stir to combine. Continue adding drops of food coloring until the desired shade is reached.

Serve warm