In a mason jar or airtight container, mix together rolled oats, almond milk, Greek yogurt, pumpkin puree, chia seeds, maple syrup, vanilla extract, and pumpkin spice.
Seal the jar or container and place it in the refrigerator to soak. Let it sit for a minimum of 2 hours, but ideally overnight for the flavors to meld and oats to soften.
When ready to eat, give the oats a good stir. Top with a bit of Greek yogurt and a sprinkle of chopped pecans for a delightful crunch.