In a 3 cup glass container with a lid, add milk, Greek yogurt, espresso, maple syrup and vanilla extract. Whisk well.
Add chia seeds and oats, stir to combine.
Cover and refrigerate for at least 8 hours or best overnight.
Add dollops of Greek yogurt on top and spread with a spoon into a single layer. Dust with cacao powder, using a small mesh sieve and enjoy warm or cold!