Dust berries with powdered sugar and stir. If using frozen berries, let them thaw for 15-20 minutes at room temperature.
In a bowl, mix mascarpone, sweet cream, and milk until smooth. Fold in amaretto, lemon juice, honey, cocoa powder, and Nutella. (For a lighter version, replace sweet cream with milk.)
Divide half the berries among four glasses, reserving the liquid. Pour half the mascarpone cream mixture over the berries.
Add the remaining berries to each glass.
Stir the reserved berry liquid into the remaining mascarpone cream mixture, then pour it into the glasses.
Refrigerate for 30 minutes.
Top each glass with 3 Amarettini biscuits just before serving.