Peel the bananas and set in a bowl. If you like a little texture in your chia pudding, use a fork to mash them well. If you like a smooth texture, blend the bananas in a blender.
Stir the milk, maple syrup, and chia seeds into the bananas until until fully combined. Cover and set in the fridge overnight, or for at least 2 hours. Stir the mixture again before serving.
Spoon the mixture into cups and top with walnuts and chocolate chips, if using.
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Notes
To store: Keep chia pudding in an airtight container and store it in the refrigerator. Use it within 4-5 days. Before serving, stir the pudding well.Nutrition information does not include optional ingredients.