Add the rolled oats (uncooked), pumpkin pie spice, salt, and chopped pecans to a jar or other resealable container. Top with the pumpkin purée, brown sugar, and milk. Close the container and refrigerate overnight or up to five days.
Before eating, stir the contents of the jar until evenly combined. Enjoy cold or microwave until warmed through.
*Use your milk of choice (dairy or non-dairy). The nutrition stats for this recipe are calculated using whole milk.