Preheat the oven to 350°
Spread the blueberry pie filling down onto a 9 x 13” baking dish.
In a medium sized bowl, beat together the cream cheese, egg, and sugar until it’s smooth.
Using a spoon, place dollops of the cream cheese mixture spread out evenly onto the top of the pie filling.
Carefully spread the cheesecake dollops over the pie filling with the back of a spoon. Try not to disturb the pie filling too much if you can help it.
Sprinkle the cake mix evenly onto top.
Slice the butter into thin pats and place them evenly, side by side, onto the top of the cake mix until it’s covered in the butter.
Place it into the oven for 40 minutes.
Let it cool, serve with whipped cream (optional) and enjoy.