In a medium mixing bowl, combine chia seeds, milk, maple syrup (or honey), vanilla extract, and a pinch of salt. Whisk well for about 30 seconds until fully mixed and smooth.Let the mixture sit for 5 minutes, then whisk again thoroughly to break up any clumps and ensure even texture. Cover the bowl or pour the mixture into two jars or serving bowls.
Refrigerate for at least 2 hours, or until thick and pudding-like (overnight chilling gives the best results).
Stir once more before serving, then enjoy as is or top with fruit, nuts, or nut butter.