01 - In a medium bowl, combine rolled oats, milk, Greek yogurt, chia seeds, maple syrup, and vanilla extract. Stir until evenly incorporated.
02 - Pour the cooled brewed coffee over the oat mixture and stir gently until fully blended.
03 - Spoon the oat mixture evenly between two jars or airtight containers.
04 - In a small bowl, blend mascarpone cheese, Greek yogurt, and maple syrup together until smooth and creamy.
05 - Spread the mascarpone mixture over the oats in each jar, smoothing the surface evenly.
06 - Seal the jars with lids and refrigerate for a minimum of 6 to 8 hours, allowing the oats to soften and 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.