Add the oats, non-dairy milk, non-dairy yogurt, pumpkin puree, maple syrup, chia seeds, pumpkin pie spice, and vanilla extract to a mason jar and stir to combine.
Cover and refrigerate overnight (or at least 4 hours).
The next morning, top with non-dairy yogurt and chopped pecans (or other desired toppings, see blog post above for ideas). Enjoy!