In a large bowl, whisk together coconut milk, pumpkin puree, and maple syrup. Add remaining ingredients and stir until well combined.
Let sit in the fridge in an airtight container for 2-4 hours, but for optimum texture and flavor, let it sit overnight.
Enjoy the oats cold, or heat them in the microwave for 1-2 minutes for a warm, pumpkin pie experience. Top with more cinnamon, maple syrup, and greek yogurt if desired!
Notes
Store overnight oats in an airtight container in the fridge for up to 5 days.