In a mixing bowl, combine the rolled oats, coconut milk, chia seeds, shredded coconut, maple syrup, vanilla extract, and a pinch of salt. Stir well to ensure everything is combined thoroughly.
Stir in half of the diced mango into the oat mixture, reserving the other half for topping.
Divide the mixture evenly into two jars or containers with lids. Seal the containers tightly.
Refrigerate the jars overnight (or for at least 4 hours) to allow the oats to absorb the liquid and soften.
In the morning, take the jars out of the refrigerator and give the oats a good stir. If desired, add a splash more of coconut milk for a creamier texture.
Top each jar with the remaining diced mango and extra shredded coconut. Garnish with fresh mint leaves if desired before serving.
Notes
Add more coconut milk for a creamier texture if desired.