Coarsely grate 1 apple half. Cover the remaining apple with plastic wrap and reserve in the fridge. Place the grated apple in a medium bowl. Add the milk, vanilla and chia seeds and stir to combine. Spoon the mixture into 2 small serving jars or glasses. Cover with plastic wrap and place in the fridge for 1 hour or overnight or until mixture is thick.
Uncover the jars or glasses. Thinly slice the reserved apple. Top the chia mixture with blueberries, sliced apple and flaked coconut to serve.