In a medium mixing bowl, mash the bananas with a fork until a smooth, liquid-like consistency is achieved.
Whisk in the almond milk, vanilla extract, cinnamon, and maple syrup until the mixture is uniform.
Stir in the chia seeds thoroughly to ensure they are evenly distributed and not clumped together.
Cover the bowl or transfer the mixture into individual glass jars with lids.
Refrigerate the mixture for at least 4 hours, or overnight, to allow the chia seeds to fully hydrate and thicken.
Stir the pudding vigorously before serving to break up any remaining clumps and garnish with fresh banana slices if desired.