Add all ingredients to a bowl and whisk together.: When you combine the chia seeds , almond milk , pumpkin purée , vanilla extract , maple syrup , and pumpkin pie spice , you should notice the liquid darkening slightly from the pumpkin and a soft spice aroma rising. Whisking introduces air and helps break up any clumps of chia seeds , ensuring even hydration. The whisking sound is gentle and the batter will look streaky at first, then more uniform as you emulsify the pumpkin into the milk. This matters because evenly distributed seeds and pumpkin produce a consistent pudding texture. A common mistake is simply stirring slowly which can leave dry pockets of seeds; vigorous whisking for about 30 seconds will prevent that, and scraping the bowl sides helps dissolve sticky bits of pumpkin.
Either cover the bowl or transfer into sealed containers (such as one larger or 2 smaller mason jars) and refrigerate for at least 3-4 hours. I prefer to refrigerate overnight.: After sealing, place the container into the refrigerator where the air is cool and still. Over the first hour you may notice the mixture thickening slightly, and by three to four hours the chia seeds should swell and gel with the almond milk , creating a pudding like consistency. Overnight refrigeration intensifies flavors and allows the seeds to fully plump, yielding a creamier mouthfeel. The environment inside the jar should be quiet, and when you remove the lid later you will detect a muted pumpkin aroma with a hint of spice. This step matters because inadequate chilling yields a runny result. Avoid leaving the mixture at room temperature for long periods, as that can prevent proper gelling and affect safety if left too long.
Before serving, give the pudding a quick stir.: When you open the container, you will often see a slightly layered look, with the chia seeds set and the liquid distributed unevenly. A quick stir brings the texture back together, smoothing the surface and releasing the full aroma of pumpkin purée and pumpkin pie spice . As you stir, pay attention to texture, aiming for a homogenous, spoonable consistency that holds its shape yet yields easily. The sound is soft, the look is glossy and slightly dense. This step matters for mouthfeel, because a final stir reincorporates any separated liquid so each bite is balanced. A frequent oversight is serving without stirring, leaving watery pockets on top; a few gentle stirs solve this.