01 - In a medium mixing bowl, combine the rolled oats, milk, cooled espresso, chia seeds, maple syrup, and vanilla extract. Stir thoroughly until all ingredients are evenly incorporated.
02 - Divide the oat mixture evenly between two jars or airtight containers, pressing gently to level the surface.
03 - In a small bowl, whisk together the mascarpone cheese, Greek yogurt, and maple syrup until the mixture is silky smooth and free of lumps.
04 - Spoon the mascarpone cream over the oat base in each jar, spreading it into an even, thick layer to mimic the mascarpone topping of classic tiramisu.
05 - Seal the jars tightly and refrigerate for at least 8 hours, allowing the oats to absorb the liquid and soften into a creamy consistency.
06 - In the morning, finish each jar with dark chocolate shavings and a light dusting of cocoa powder. Add crumbled ladyfinger pieces and a drizzle of espresso if desired. Serve chilled — stir everything together or enjoy each layered bite separately.