Combine chia seeds, milk, maple syrup, vanilla extract, and salt in a small glass jar or bowl.
Whisk or stir the mixture vigorously for 1 minute to ensure all seeds are evenly distributed and submerged.
Allow the mixture to sit at room temperature for 10 minutes.
Stir the mixture a second time to break up any clumps that formed during the initial hydration period.
Cover the container and refrigerate for at least 2 hours, or until the liquid is fully absorbed and the texture is thick.
Stir once more before serving to ensure a uniform consistency.