In a large mixing bowl combine the Greek yogurt, milk, pumpkin puree and sweetener-of-choice (if desired). Stir until fully combined. To the same bowl add the oats, pumpkin pie spice and chia seeds. Mix well. Cover bowl or transfer to individual jars and refrigerate for at least 4 hours to overnight. Enjoy topped with plain Greek yogurt, nuts, seeds and cocoa nibs.

Store any leftover overnight oats in a sealed jar or container in the refrigerator for up to 4-5 days.