Preheat the oven to 350 degrees F (175 degrees C).

Combine flour, butter, and white sugar together in a bowl; beat until fluffy. Pat into the bottom of a 9x13-inch baking pan.

Bake in the preheated oven until firm, about 20 minutes. Allow to cool completely, about 30 minutes.

Beat whipped topping, cream cheese, and confectioners' sugar together in a bowl. Spread evenly and smoothly over the crust in the baking pan.

Top cream cheese mixture with blueberry pie filling. Refrigerate 8 hours to overnight.