3 nutella mousse cake Recipes

hazelnuts, toasted and skins rubbed off, sugar, all-purpose flour, unsalted butter, softened, unsweetened dutch cocoa, salt, unflavored gelatin (from a 1/4-oz envelope), cold water, chocolate hazelnut spread , such as nutella (5 oz), mascarpone (1/4 lb), chilled heavy cream, unsweetened dutch cocoa, sugar, heavy cream , plus, heavy cream, fine-quality bittersweet chocolate, chopped (not unsweetened )

unsalted butter, softened, plus more for the pan, all-purpose flour, plus more for the pan, unhusked hazelnuts, toasted, unsweetened cocoa powder, baking powder, kosher salt, sugar, vanilla extract, eggs, hazelnut paste, nutella, mascarpone cheese or cream cheese, heavy cream, chilled