01 - In a medium bowl, combine the rolled oats, milk, Greek yogurt, chia seeds, maple syrup (or honey), and vanilla extract. Stir thoroughly until evenly mixed.
02 - Pour the cooled strong brewed coffee over the oat mixture and fold it in until fully incorporated.
03 - Divide the oat mixture evenly between two jars or airtight containers, pressing gently to level.
04 - In a small bowl, blend the mascarpone cheese, Greek yogurt, and maple syrup together until completely smooth and creamy.
05 - Spoon the mascarpone mixture over the oats in each jar, spreading it into an even layer on top.
06 - Seal the jars with lids and refrigerate for a minimum of 6 to 8 hours (preferably overnight) to allow the oats to soften and the flavors to meld.
07 - Before serving, use a fine mesh sieve to dust the tops generously with cocoa powder. Add dark chocolate shavings if desired. Serve chilled.