In a medium bowl, beat together cream and vanilla extract with a mixer at medium-high speed until stiff peaks form, 2 to 3 minutes.
In a small bowl, sift together confectioners’ sugar and cocoa powder.
In a large bowl, beat together mascarpone cheese and sugar mixture with a mixer at medium-low speed until thick and creamy, 1 to 2 minutes. Gently fold cheese mixture into whipped cream mixture, just until combined. Use immediately.
Recipe by TeaTime Magazine at https://teatimemagazine.com/mini-rum-cakes-chocolate-mascarpone-whipped-topping/