01 - In a medium bowl, combine the rolled oats, milk, brewed espresso, chia seeds, maple syrup, and vanilla extract. Stir thoroughly until all ingredients are evenly incorporated.
02 - Divide the oat mixture evenly between two serving jars or airtight containers, distributing the liquid so both portions soak uniformly.
03 - In a small bowl, whisk together the mascarpone cheese, Greek yogurt, and maple syrup until the mixture is completely smooth and creamy with no lumps remaining.
04 - Spoon the mascarpone mixture over the oat base in each jar, spreading it into an even, thick layer on top.
05 - Seal the jars tightly and refrigerate for at least 8 hours so the oats absorb the liquid and soften to a creamy consistency.
06 - In the morning, finish each jar with dark chocolate shavings and a generous dusting of unsweetened cocoa powder. Add 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.