In a medium-sized mixing bowl, combine the rolled oats, coconut milk, chia seeds, maple syrup, vanilla extract, and a pinch of salt. Stir well to ensure all ingredients are combined.
Gently fold in the diced mango and shredded coconut, reserving a small amount of diced mango and coconut for topping if desired.
Cover the bowl with plastic wrap or transfer the mixture into individual jars. Refrigerate overnight (or at least 4 hours) to allow the oats and chia seeds to absorb the liquid and soften.
The next morning, give the oats a good stir to break up any clumps. If the mixture is too thick, add a splash of coconut milk to reach your preferred consistency.
Serve in bowls or jars, topped with the reserved mango, extra shredded coconut, and fresh mint leaves for garnish.
Notes
For a sweeter taste, adjust the maple syrup or honey to your preference.