Cover and refrigerate overnight or at least 8 hours.
Transfer mixture to a high-powered blender and blend until completely smooth. If pudding is warm from blending, return to refrigerator until chilled. (Alternately, you can just stir the pudding and eat it without blending.)
This pudding is thick, almost like a mousse. If you've blended your pudding and decide you want it a little thinner, add some extra milk. Be sure to blend the pudding until completely smooth—if you don't, it will be gritty! A high-powered blender like the Vitamix works best. Any sweetener you like will work in this, and if 1 tablespoon of maple syrup isn't sweet enough, feel free to add more.