01 - 
                Heat oven to 350°F. Spray two 9-inch round pans with baking spray.
              
              
              
                02 - 
                Mix cake mix, water, oil, and egg whites until smooth.
              
              
              
                03 - 
                Split batter between pans. Bake 22-25 minutes until toothpick comes out clean. Cool completely.
              
              
              
                04 - 
                Mix hot water, sugar, espresso powder, and Kahlua. Set aside.
              
              
              
                05 - 
                Stir mascarpone until smooth in a bowl.
              
              
              
                06 - 
                Beat cold cream and vanilla until stiff peaks form (3-5 minutes).
              
              
              
                07 - 
                Add sugar to cream mixture gradually. Beat 1-2 minutes more.
              
              
              
                08 - 
                Mix in mascarpone slowly, ¼ at a time until smooth.
              
              
              
                09 - 
                Set aside ⅔ cup frosting in piping bag with star tip.
              
              
              
                10 - 
                Cut each cake in half horizontally for 4 layers total.
              
              
              
                11 - 
                Place bottom layer on plate, brush with coffee syrup, spread 1¼ cups frosting. Repeat with next 2 layers.
              
              
              
                12 - 
                Brush with coffee syrup, spread 1½ cups frosting on top.
              
              
              
                13 - 
                Cover sides with remaining frosting.
              
              
              
                14 - 
                Dust top with cocoa powder using a sifter.
              
              
              
                15 - 
                Pipe frosting swirls around edge and center. Top each swirl with a coffee bean.