3 coffee chocolate layer cake 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