For the base:
• 1 box lemon cake mix
• ½ cup butter, melted
• 1 egg
For the filling:
• 8 oz cream cheese, softened
• 2 eggs
• 1 tsp vanilla extract
• Zest of 1 lemon
• 2 cups powdered sugar
• ½ cup fresh raspberries
• ½ cup fresh blueberries
• ¼ cup heavy cream