In a mixing bowl, add the chia seeds, milk, honey/maple syrup (if using), and vanilla extract (if using). Stir well to combine.
Cover the bowl and place it in the refrigerator for at least 4 hours, or overnight, to allow the chia seeds to soak up the liquid and expand.
Once the chia seeds have soaked and become gel-like in texture, give them a stir to make sure they are evenly distributed throughout the milk.
Serve the chia seed pudding in bowls or jars, topped with your favorite fresh fruit or nuts if desired.
Enjoy immediately or store in the refrigerator for up to 3 days.