Preheat oven to 350F.
Open cans of blueberry filling and pour them into a 9 x 13 cake pan.
In a bowl, combine the white cake mix, sugar and butter.
Mix until combined and crumbly.
Sprinkle crumble topping over blueberry pie filling.
Bake in preheated oven for 35 minutes.
Let Cool before serving as pie filling will firm up as it thickens. Pie filling WILL BE VERY JIGGLY when it first comes out of the oven.
Pie filling WILL BE VERY JIGGLY when it first comes out of the oven.