01 -
Turn your oven on to 350°F. Coat a 9×13-inch pan with a good layer of baking spray.
02 -
Toss the cake mix, butter, and egg together in a bowl. Spread it evenly in the pan’s bottom.
03 -
Whip cream cheese until fluffy. Add vanilla, lemon zest, eggs, powdered sugar, and heavy cream, blending till smooth.
04 -
Carefully mix raspberries and blueberries into the filling. Spread this over the first layer.
05 -
Pop it in the oven for about 35-40 minutes, just until the edge firms up but the middle still wiggles a bit.
06 -
Wait for it to cool completely, then top with whipped cream and extra berries if you like. Cut and enjoy!