Make the Ice Cream base: Add all of the ingredients except for the peanut butter cups to a blender and blend until no lumps remain.
Pour the mixture into the Ninja Creami container.
Store in the freezer overnight.
Make the Ice Cream: Remove the frozen Creami container from the freezer and place it in the Creami machine and hit the 'Ice Cream' setting.
Remove the Creami container from the machine and add 1 tablespoon of nut milk.
Place back in the machine with the lid on and select 'Respin'.
Perform this respin process 2x until the mixture is creamy and smooth.
Stir a ⅓ cup of the peanut butter cups into the ice cream.
Place the Creami back in the dock and select 'Mix-ins'.
Once it has spun a final time, remove and serve with more peanut butter cups.
