In a blender, blitz the milk, blueberries and maple syrup until the milk turns purple. Put the chia and oats in a mixing bowl, pour in the blueberry milk and stir very well. Leave to soak for 5 mins, stirring occasionally, until the liquid has absorbed, and the oats and chia thicken and swell.
Stir again, then divide between two bowls. Arrange the fruit on top, then sprinkle over the mixed seeds. Will keep in the fridge for 1 day. Add the toppings just before serving.