01 - In a medium mixing bowl, stir together the rolled oats, milk, cooled espresso, chia seeds, maple syrup, and vanilla extract until evenly combined.
02 - Divide the oat mixture evenly between two serving jars or airtight containers, spreading to form an even layer.
03 - In a small bowl, whisk the mascarpone cheese, Greek yogurt, and maple syrup until smooth and creamy with no lumps remaining.
04 - Spoon the mascarpone mixture over the oat base in each jar, spreading it into a thick, even layer on top.
05 - Seal the jars tightly and refrigerate for at least 8 hours or overnight, allowing the oats to absorb the liquid and soften completely.
06 - In the morning, finish each jar with a generous dusting of cocoa powder and dark chocolate shavings. Add crumbled ladyfinger pieces and a light drizzle of espresso if desired. Serve chilled—stir the layers together or enjoy each one separately.