6 ounces white chocolate, chopped
1 (15-ounce) can pumpkin purée
1/2 teaspoon vanilla extract
1/4 teaspoon ground cinnamon
1/4 teaspoon kosher salt
1/8 teaspoon ground nutmeg
1 cup heavy cream
Heat chocolate in a medium heatproof bowl in a microwave on high 30 seconds. Stir, then heat 15 seconds more. Repeat until chocolate is melted and smooth.
Mix pumpkin, vanilla, cinnamon, salt, and nutmeg in another medium heatproof bowl. Heat in microwave on high until warm to the touch, about 1 minute.
Add a large spoonful of pumpkin mixture to chocolate and whisk to combine. Add one-third of remaining pumpkin mixture to chocolate and whisk to combine. Repeat two more times until pumpkin mixture is incorporated and smooth. Strain through a fine-mesh sieve into a large bowl—mixture should be cool to the touch; if it’s still warm, let sit 5 minutes.
Add mixture to whipped cream dispenser with 1/4 cream. Charge with 1 N20 charger shake and serve.