Mix the coffee base: In a small bowl or directly in your jar, whisk the milk with espresso powder until the granules dissolve. Stir in vanilla and maple syrup or honey.
Add the dry ingredients: Add oats, protein powder, a pinch of salt, and chia seeds if using.
Stir until no dry pockets remain. The mixture should look a little loose—it will thicken overnight.
Make the “tiramisu” cream (optional but great): In another small bowl, mix Greek yogurt with mascarpone and 1–2 tablespoons of cooled brewed coffee. Sweeten lightly with a drizzle of maple syrup if you like.
Aim for a smooth, spoonable cream.
Layer it up: Spoon half the oat mixture into a jar. Add a layer of the tiramisu cream. Top with the remaining oats, then finish with another thin layer of cream.
No jar? A small container works fine.
Chill: Cover and refrigerate for at least 4 hours, but overnight is best. The oats soften, and the flavors meld.
Finish and serve: Right before eating, dust generously with cocoa powder.
Add a few dark chocolate shavings or cacao nibs for texture. Taste and adjust sweetness if needed.