1. 1. Combine the Dry Ingredients: In a medium-sized jar with a lid, or a small mixing bowl, add the rolled oats, vanilla protein powder, chia seeds, pumpkin pie spice, and a pinch of salt. Use a spoon or whisk to thoroughly combine these dry ingredients. This helps prevent the protein powder from clumping later.

2. 2. Add the Wet Ingredients: Pour in the milk and pumpkin puree. If you are using maple syrup or honey for sweetness, add it now as well.

3. 3. Mix Thoroughly: Stir all the ingredients together very well. Make sure there are no dry pockets of oats or protein powder stuck to the bottom or sides of the jar. The mixture should look consistent and creamy. Scrape down the sides of the jar to ensure everything is incorporated.

4. 4. Seal and Chill: Once everything is mixed, place a lid securely on the jar or cover the bowl tightly with plastic wrap. Transfer the jar or bowl to the refrigerator.

5. 5. Allow to Set: Let the oats chill in the refrigerator for at least 4 hours. For the best texture and flavor, it’s highly recommended to let them chill overnight (8 hours or more). During this time, the oats will soften, and the chia seeds will absorb the liquid, creating a thick, pudding-like consistency.

6. 6. Serve and Enjoy: The next morning, or after the chilling period, remove the oats from the refrigerator. Give them a quick stir. If they are too thick for your liking, you can add a splash more milk to reach your desired consistency. Serve cold, optionally topped with your favorite garnishes.