Using a handheld or stand mixer, whip the heavy cream to stiff peaks.
In a separate bowl, whisk together the condensed milk, peppermint extract, vanilla extract, and green food colouring. Gently fold in the whipped cream. Add more food colouring if needed. Fold in the chocolate chips.
Pour the mixture into a 9x5-inch loaf pan, and cover tightly. Place in the freezer for at least 6 hours, or overnight before serving.