In a medium bowl, whisk together softened cream cheese, mashed ripe banana, whole milk, heavy cream, granulated sugar, vanilla extract, and a pinch of salt until the mixture is completely smooth and creamy.

Pour the smooth mixture into the Ninja Creami pint container, ensuring you secure the lid tightly. Place the container in the freezer and freeze for at least 24 hours, or until solid.

Once the mixture is completely frozen, remove the lid from the pint container and place it inside your Ninja Creami machine. Select the 'LITE ICE CREAM' or 'ICE CREAM' function, which takes about 2-3 minutes.

After the initial processing, create a well in the center of the ice cream and add your crushed vanilla wafers and chopped fresh banana. Return the pint to the Ninja Creami and select the 'MIX-IN' function.

Your Ninja Creami Banana Cream Pie Ice Cream is now ready to serve! Enjoy immediately or garnish with extra vanilla wafers or whipped cream.