In a large bowl, whisk together the coconut milk, maple syrup, and vanilla extract. Slowly whisk in the chia seeds. If you pour them in quickly, they’ll clump.
Stir every few minutes for the first ten minutes, then refrigerate the mixture. Let it thicken for at least 3 hours, or as long as a few days.
When ready to serve, divide the chia coconut pudding into 3 bowls or jars, and top with berries.
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Notes
If the pudding doesn't start to thicken after you've added the chia seeds, add additional seeds 1 tablespoon at a time until it begins to thicken. Then refrigerate.