In a standalone mixer or bowl whip cream until soft peaks form. Fold in vanilla.

Spread whipped cream evenly in a baking tray lined with baking paper.

Dissolve cocoa powder in 1 tablespoon of hot water then swirl in the cream in a fun pattern. Freeze for at least an hour.

Remove from freezer and cut into fun shapes, pop in hot chocolates, or store back in the freezer.