01 - In a medium mixing bowl, combine the rolled oats, milk, cooled espresso, chia seeds, maple syrup, and vanilla extract. Stir until all ingredients are evenly incorporated.
02 - Divide the oat mixture evenly between two jars or airtight containers, spreading into an even layer at the bottom.
03 - In a small bowl, whisk together 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, to allow the oats to soften and the flavors to meld.
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 everything together or enjoy each layer separately for a true tiramisu experience.