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.
