In a mixing bowl, combine Greek yogurt, almond milk, pumpkin puree, vanilla extract, and maple syrup. Whisk until smooth.

Stir in the rolled oats, chia seeds, and pumpkin pie spice until well mixed.

Transfer the mixture into a glass jar or an airtight container, packing it gently to minimize air pockets.

Seal tightly and refrigerate for at least 4 hours or overnight to allow the oats to absorb flavors.

In the morning, stir the oats and add more almond milk if needed. Serve chilled and garnish with toppings of choice.