preheat oven to 350* Bake for 45 minutes
Spray a glass 9 x 13 casserole with Pam.
Pour pineapple in the bottom and spread around, pour in Blueberry Pie filling and spread around the bottom mixing with the pineapple...
Sprinkle the dry cake mix over the top of blueberries and pineapple evenly, pat down with spatula or hand..
Cut pats of butter and place on top of cake mix, do not stir...
Place in oven and cook...when golden brown on top....Pull out and serve warm with vanilla bean Ice cream or Half and Half, and Whip Cream...Also good by itself..