01 - In a medium bowl, combine the rolled oats, milk, Greek yogurt, chia seeds, maple syrup (or honey), and vanilla extract. Stir thoroughly until all ingredients are evenly incorporated.
02 - Pour the cooled strong brewed coffee over the oat mixture and stir until fully blended.
03 - Divide the oat mixture evenly between two jars or airtight containers, spreading it into an even layer.
04 - In a small bowl, blend the mascarpone cheese, Greek yogurt, and maple syrup together until smooth and creamy.
05 - Spoon the mascarpone mixture over the oats in each jar, spreading it into an even layer on top.
06 - Cover the jars securely 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 together.
07 - Before serving, use a fine mesh sieve to dust the tops generously with unsweetened cocoa powder. Add dark chocolate shavings if desired. Serve chilled.