01 - In a medium mixing bowl, combine the rolled oats, milk, Greek yogurt, chia seeds, maple syrup, and vanilla extract. Stir thoroughly until all ingredients are evenly incorporated.
02 - Pour the cooled strong brewed coffee over the oat mixture and fold gently until the coffee is uniformly distributed throughout.
03 - Divide the oat mixture evenly between two jars or airtight containers, pressing lightly to settle the contents.
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 and smoothing the surface.
06 - Seal the jars tightly with lids and refrigerate for a minimum of 6 to 8 hours, allowing the oats to absorb the liquid and the flavors to meld together.
07 - Before serving, use a fine mesh sieve to dust the tops generously with unsweetened cocoa powder. Finish with dark chocolate shavings if desired. Serve chilled.