Lemon Berry "Cheese" Cake

I couldn't remember if I had posted this. It is so simple and elegant. Great to entertain with. Put the berries in the batter after putting the batter in the pans. 1 box white cake mix, prepared according to directions. Add 1 tbsp lemon juice 1 cup blueberries 1 cup raspberries 1 container mascarpone cheese 2 tbsp sugar 1 lemon, zested 1 tbsp flour powdered sugar Mix cake batter according to box, however only use the egg whites. Add 1 tbsp lemon juice. Add extra egg white if needed. Divide between 2 9 inch cake pans, greased and floured. Toss berries with flour. Drop berries evenly into the two cake pans. Bake according to package. While cake is baking, mix cheese, lemon zest and sugar. When cake is totally cooled, place 1 layer on a cake stand or plate. Top with cheese mixture. Place second cake on top and press down lightly to spread the cheese mixture to the edges. Dust with powdered sugar.