Mint Chocolate Fudge

Line an 8x8 pan with foil so that it is sticking out over the edges.Separately, melt the chocolate in the microwave following the instructions on the bag. Stir well after every 30-second interval, being careful not to overheat the chocolate.Add half of the sweetened condensed milk to one bowl of melted chocolate and half to the other.Add the mint extract to the chocolate bowl, and add the green food coloring to the white chips. Stir until fully combined.Randomly add the fudge mixture from each bowl to the prepared pan. Shake the 8x8 pan a little to even it out. Gently run a butter knife a few times through to create a swirled effect.Refrigerate overnight. Pull the foil (with the fudge) out of the pan and away from the fudge. Trim the rough edges slightly to create a clean edge. Cut the block of fudge into four large pieces. Cut each fourth into 9 pieces for a total of 36 pieces of fudge. Serve or store in an airtight container.