3 chocolate creme fraiche topping Recipes

chocolate wafer crumbs , about half of 1 9-oz package, about 23 cookies, finely ground in processor, sugar, unsalted butter, melted, bittersweet chocolate, finely chopped (60% cacao), sugar, unsweetened cocoa powder, cornstarch, salt, whole milk, divided, heavy whipping cream, bittersweet chocolate, finely chopped (60% cacao), dark rum, vanilla extract, chilled creme fraiche, chilled heavy whipping cream, sugar, vanilla extract, bittersweet chocolate shavings (optional)

chocolate-hazelnut spread , such as nutella, dark or semisweet chocolate (70 percent and over), chopped, whole milk, heavy cream, granulated sugar, kosher salt, egg yolks, sriracha sauce, instant espresso powder , optional, vanilla extract, cream or creme fraiche, for topping, cocoa or grated chocolate, for dusting, minced hazelnuts , for garnishing, sea salt , for garnishing