01 - In a medium bowl, combine the rolled oats, milk, Greek yogurt, chia seeds, maple syrup, and vanilla extract. Stir thoroughly until evenly mixed.
02 - Pour the cooled strong brewed coffee over the oat mixture and stir until fully incorporated.
03 - Divide the oat mixture evenly between two jars or airtight containers.
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, allowing the oats to soften and the flavors to meld.
07 - Before serving, dust the tops generously with cocoa powder using a fine mesh sieve and garnish with dark chocolate shavings if desired. Serve chilled.