3 coffee chocolate mascarpone frosting Recipes

cake flour, natural unsweetened cocoa powder, baking soda, salt, unsalted butter, room temperature, golden brown sugar, eggs, vanilla extract, buttermilk, instant espresso powder dissolved in 3/4 cup hot water, natural unsweetened cocoa powder, instant espresso powder, chilled heavy whipping cream, divided, sugar, chilled mascarpone cheese, bittersweet chocolate curls (optional)

wax paper -- to line 2 8 pans, french vanilla cake mix -- 18.25 oz, swiss mocha cappuccino mix -- 1.16 oz, vegetable oil, eggs, cinnamon - espresso syrup -- see below, mascarpone frosting -- see below, chocolate-covered toffee candy bars, chopped -- such as skor or heath bars, garnish: additional chopped chocolate-covered toffee candy bars, semisweet chocolate and white chocolate shavings -- optional ..., sugar, cinnamon stick -- broken in half, instant espresso powder -- or 2 tbsp regular instant coffee, coffee liqueur -- such as kahlua ..., mascarpone cheese -- 8 oz each, powdered sugar, vanilla extract, cinnamon-espresso syrup -- from above, whipping cream