In a blender, combine your milk of choice, protein powder, pudding mixes, vanilla extract, sweetener, and salt. Blend until smooth and fully combined.
Pour the mixture into a Ninja Creami pint and freeze on a level surface for 24 hours.
Remove the pint from the freezer and run hot water over the sides and bottom for 1-2 minutes.
Spin on Lite Ice Cream mode.
Re-spin 1-2 times until smooth and creamy.
Create a well in the center of your ice cream. Add 2 Nilla wafers into the well and spin on Mix-In mode
Crush 2 more Nilla wafers over the top. Add a few banana slices and enjoy!