In a small jar or bowl, gather your quick oats, chia seeds, non-dairy milk, pistachio butter, maple syrup, vanilla, and matcha powder if you're using it.
Whisk the ingredients together thoroughly, making sure the pistachio butter is fully blended in and no dry clumps remain.
Cover your container and place it in the refrigerator overnight, or for a minimum of 4 hours, to let the oats soften into a luscious, pudding-like treat.
The next morning, give your oats a good stir (feel free to pour in a tiny splash of milk if you like a thinner texture). Top with spoonfuls of vegan yogurt, crunchy chopped pistachios, and fresh raspberries, then dig in!