In a large mixing bowl, combine the rolled oats, pistachio milk, Greek yogurt, maple syrup, chia seeds, vanilla bean paste, cinnamon, and salt.
Stir thoroughly until all ingredients are evenly incorporated.
Fold in the chopped pistachios.
Divide the mixture evenly among four 8-ounce jars or airtight containers.
Cover and refrigerate overnight, or for at least 4 hours.
When ready to serve, enjoy your Pistachio Overnight Oats topped with pistachio cream, extra chopped pistachios, and fresh fruit if desired.