Milk Chocolate & Mint Swirled Fudge

and 1/2 cups milk chocolate chips ((Guittard or Ghirardelli))

sweetened condensed milk, (separated into 2 equal parts)

vanilla extract

and 1/2 cups white chocolate chips ((Guittard or Ghirardelli, cheaper white chocolate has the tendency to seize))

peppermint extract, (depending on preference)

drops green food coloring (optional)