In a large mixing bowl, whisk together the heavy cream, whole milk, granulated sugar, vanilla extract, and salt until the sugar is fully dissolved.
Gently fold in the crushed chocolate sandwich cookies and mini chocolate chips until evenly distributed.
Pour the mixture into the Ninja Creami container, ensuring not to exceed the fill line.
Secure the lid on the container and freeze for at least 24 hours, or until completely solid.
Once frozen, remove the container from the freezer and let it sit at room temperature for about 5 minutes to soften slightly.
Place the container in the Ninja Creami machine and process according to the manufacturer's instructions until creamy and smooth.
Serve immediately or transfer to an airtight container and freeze for up to 2 weeks.