Stir together 1¼ tsp powdered gelatin and 2 tbsp cold water in a small bowl. Let sit 5–10 minutes. Set aside.
Heat the ½ cup heavy cream until steaming, do not boil.
In a large bowl, combine the chopped white chocolate and salt. Pour the hot heavy cream over the chocolate.
Let sit 2 mins, then stir gently until smooth. Use an immersion blender if needed.
Microwave the bloomed gelatin for 5 seconds until just liquefied.
Stir into warm ganache until fully dissolved.
Add in 5 tbsp cold cream and vanilla bean paste until glossy, smooth and fully emulsified.
Refrigerate 6+ hours or overnight until thick like pudding.
Add ¼ cup cold mascarpone to the mixture, then whip on medium-low speed until fluffy and holding soft-stiff peaks. Go slow, dont rush this process.
Stop the second it holds shape—overwhipping will break the emulsion. Enjoy!
