Whisk together the milk and chia seeds in a medium bowl. Add in the peanut butter, cocoa powder, dates (or prunes) and vanilla. Stir a couple of times and place in the fridge overnight.
In the morning, scrape the contents into a food processor, and process until smooth.
Portion into bowls and top with desired toppings. Serve right away, or store in an airtight container in the fridge until ready to serve.