01 - Preheat oven to 350°F. Grease a 9x13-inch baking dish thoroughly.
02 - Spread fresh or frozen blueberries and blueberry pie filling evenly across the bottom of the prepared dish. Sprinkle lemon zest over the surface and drizzle with lemon juice.
03 - In a medium bowl, beat cream cheese, sugar, egg, and vanilla extract until completely smooth and creamy.
04 - Drop spoonfuls of the cheesecake mixture over the blueberry layer. Gently spread to cover, taking care not to fully mix the layers.
05 - Evenly distribute the lemon cake mix over the entire surface, covering completely.
06 - Drizzle melted butter evenly across the cake mix, ensuring most of the dry mix is moistened.
07 - Bake for 40–45 minutes until the top is lightly golden and edges are bubbling.
08 - Let cool for 15 minutes before serving. Enjoy warm or at room temperature, optionally topped with whipped cream or vanilla ice cream.