Add the rolled oats and almond milk to a mason jar or small bowl.
Add the pumpkin pie spice, pumpkin puree, chia seeds, maple syrup, sea salt, and protein powder or Greek yogurt if using.
Stir well until the oats, pumpkin, chia seeds, and liquid are fully combined.
Cover with a lid and refrigerate for at least 4 hours, or overnight.
Stir before serving. Add a splash of almond milk if the oats are too thick.
Top with pecans, hemp seeds, pepitas, nut butter, coconut whipped cream, dried cranberries, granola, or your favorite toppings.
Serve cold or warm gently in the microwave if desired.