Gather all your ingredients—rolled oats, chopped pistachios, chia seeds, milk, Greek yogurt, honey or maple syrup, and vanilla extract.

In a medium bowl, combine rolled oats, chopped pistachios, chia seeds, and optional spices. Stir thoroughly.

In a separate bowl, whisk together milk, Greek yogurt, honey or maple syrup, and vanilla extract until smooth. Pour over dry ingredients.

Transfer the mixture into airtight containers and refrigerate overnight for at least 6 hours.

In the morning, stir your oats, checking for desired consistency. Top with additional pistachios, fresh fruit, or honey.