01 -
Set the oven to 350°F and grease a 9x13-inch pan lightly with butter.
02 -
Cover the bottom of the pan with pie filling. Add an even layer of cake mix, then arrange slices of butter evenly over the top. Scatter the blueberries last.
03 -
Pop it into the oven for 60-65 minutes. Bake until the top is golden, crispy, and bubbling with goodness.
04 -
Dish it up warm, with a scoop of vanilla ice cream if you'd like.