In a clean mason jar or airtight container, add rolled oats, milk, sugar, and chia seeds. Sprinkle in cardamom powder and salt. If using, add saffron.

Stir the mixture vigorously until all ingredients are well combined and oats are fully coated.

Cover the jar tightly and place it in the refrigerator. Allow to soak for at least 6 hours, ideally overnight.

The next morning, stir the oats again to ensure everything is well mixed. Adjust sweetness by adding more sugar if desired.

Spoon the oats into bowls and sprinkle chopped pistachios on top before serving.