In a jug or small bowl, whisk together the whole milk, double cream, confectioners’ sugar, and vanilla extract until the sugar is fully dissolved.
Pour the mixture into your Ninja Creami pint container, stopping just below the fill line.
Freeze on a completely flat surface for 24 hours, until fully solid.
After freezing, remove the lid and place the pint into the Ninja Creami machine. Process using the Ice Cream function.
When the first cycle finishes, create a small well down the centre of the ice cream.
Add the crushed Oreos along with 1–2 tablespoons of milk, which helps the mix-ins blend smoothly.
Process again on the Mix-In setting until the cookies are evenly incorporated.
Serve immediately for a soft texture, or return to the freezer for 1–2 hours to firm up.
