In a large mixing bowl or container, add the chia seeds. Set aside.
In a blender, add fresh mango pieces, coconut milk, sweetener, and vanilla extract. Blend until smooth.
Pour the mango mixture over the chia seeds and use a whisk or fork to stir, and evenly distribute the chia seed in the mixture.
Close the container with a lid and refrigerate overnight or at least 8 hours. You may want to stir the mixture after 30 minutes to prevent the seeds from forming lumps and sinking to the bottom of the container.
Store up to 3 days in a sealed mason jar in the fridge.
