Blend the cream base: In a blender or food processor, combine Greek yogurt, blended cottage cheese, protein powder, sweetener, vanilla, and salt.
Blend until silky and thick. Taste and adjust sweetness.
Chill the cream: Transfer to a bowl and refrigerate for at least 10 minutes. This lets the protein powder hydrate and the mixture firm up slightly.
Mix the coffee soak: In a shallow dish, stir together cooled espresso, optional liqueur, and sweetener if using.
Keep it cold to prevent over-soaking.
Prep the cups: Set out 6 small glass cups, ramekins, or jars (6–8 ounces each). Have your cookie pieces ready.
Dip lightly: Briefly dip each cookie piece in the coffee mixture for 1–2 seconds. You want it lightly moistened, not soggy.
Layer one: Add a spoonful of cream to the bottom of each cup.
Top with a layer of dipped cookie pieces. Add another layer of cream to cover.
Repeat: Add a second layer of dipped cookies and finish with a generous final layer of cream. Smooth the tops with the back of a spoon.
Dust and chill: Sift cocoa powder over the top of each cup.
Add chocolate shavings if you like. Cover and refrigerate for at least 2 hours, ideally 4–6, to set flavors.
Serve: Enjoy cold. The texture should be creamy, spoonable, and slightly firm, with just a hint of coffee-soaked bite from the cookies.