Passion Fruit Cake Filling. Whisk this fluffy, it takes just a few minutes. In the bowl of a stand mixer fitted with the paddle, mix the flour, sugar, baking powder and salt at low speed.
Remove from heat and add in the passion fruit. In a large bowl, add mascarpone, heavy cream, powdered sugar, and vanilla. Place one cake on a serving dish/cake stand.
Preheat the oven to 350°.
In the bowl of a standing mixer, add the cake mix, 3 eggs, 2 egg whites, 1/3 cup vegetable oil, 1/3 cup buttermilk, and 1/3 cup water. Place one cake on a serving dish/cake stand. Place the second cake on top and spread that with the passion fruit mousse (again, i only used about half the mixture.). Add the cold passionfruit and with a spatula combine until smooth.