01 - In a medium bowl, combine the rolled oats, milk, espresso or coffee, chia seeds, maple syrup, and vanilla extract. Stir thoroughly until evenly incorporated.
02 - Divide the oat mixture evenly between two jars or airtight containers.
03 - In a small bowl, whisk together the mascarpone cheese, Greek yogurt, and sweetener until smooth and creamy.
04 - Spoon the mascarpone mixture over the oat base in each jar, creating a thick, even layer on top.
05 - Cover the jars securely and refrigerate for at least 8 hours to allow the oats to soften and the flavors to meld.
06 - In the morning, finish each jar with dark chocolate shavings and a dusting of cocoa powder. Add ladyfinger pieces and a light drizzle of coffee if desired. Serve chilled—stir everything together or enjoy each layer separately for a true tiramisu experience.