Preheat oven to 350°

In medium mixing bowl, combine yellow cake mix, 1, egg and 1 stick ( 8 tablespoons).butter. Use large spoon to press mixture together ( use hands if needed)

Once thoroughly mixed place into 9 x 13 baking dish and press out to line bottom of the pan.

Using electric mixing beat together 1 stick (8 tablespoons) butter, 3 eggs, cream cheese and vanilla.

Add blueberries and continue mixing. When blueberries are mixed in gradually add powdered sugar.

Pour over crust and bake uncovered at 350° for 40 – 50 minutes. Let cool for 15 – 20 minutes serve warm.