In a mixing bowl, combine the rolled oats, pumpkin puree, milk, cinnamon, nutmeg, ginger, and maple syrup. Whisk thoroughly until the mixture is smooth and the spices are evenly distributed.
If using, add a splash of vanilla extract to enhance the aroma, then stir again.
Pour the mixture into a jar or airtight container, then fold in the cranberries and toasted pumpkin seeds. This adds color, texture, and bursts of flavor to the oats.
Cover the jar tightly with a lid and refrigerate overnight, or for at least 6 hours, so the oats fully absorb the flavors and soften.
Once ready to serve, give the oats a gentle stir to ensure everything is well combined and evenly coated with spices and flavors.
Transfer the oats to a bowl or enjoy straight from the jar. Top with extra pumpkin seeds or cranberries if desired for added crunch and visual appeal.