Whisk chia seeds and protein powder in a mixing bowl until combined.
Stir in almond milk, espresso, maple syrup, and vanilla extract until smooth.
Allow the mixture to sit for 10 minutes, then whisk again to break up any clumps.
Cover and refrigerate for a minimum of 4 hours or until a pudding-like consistency is achieved.
Layer the chilled pudding into serving glasses, alternating with layers of Greek yogurt.
Sift cocoa powder over the top layer before serving.