01 - In a medium bowl, combine oats, milk, yogurt, chia seeds, maple syrup, and vanilla extract. Stir thoroughly until all ingredients are well incorporated and the mixture is uniform.
02 - In a small bowl, whisk together espresso, mascarpone cheese, cocoa powder, and maple syrup until completely smooth and no lumps remain.
03 - Spoon half of the oat mixture evenly between two jars or bowls, spreading to create an even layer at the bottom.
04 - Top each jar with half of the tiramisu mixture, spreading gently to cover the oat layer completely.
05 - Add the remaining oat mixture on top of the tiramisu layer, then finish with the remaining tiramisu mixture, creating distinct layers.
06 - Cover the jars or bowls tightly with lids and refrigerate for at least 8 hours or overnight to allow flavors to meld and oats to soften.
07 - Before serving, dust the top generously with cocoa powder and sprinkle with dark chocolate shavings if desired.