In a medium bowl, whisk together the whole milk, double cream, confectioners sugar, peppermint extract, and green gel food colouring until the sugar has fully dissolved.

Pour the mixture into the Ninja Creami pint container and secure the lid.

Freeze for 24 hours on a completely level surface.

Once frozen, remove the lid and place the pint into the Ninja Creami machine.

Run the Ice Cream function.

When the cycle finishes, create a small well down the centre of the ice cream and add the 1–2 tablespoons milk and the chocolate chips.

Run the Mix-In cycle to evenly distribute the chocolate throughout.

Scoop and serve immediately.