This recipe is very popular in my neck of the woods. If you go to pot lucks, chances are you have had this before. The pineapple is very complimentary to the blueberries. Moist and delicious and serves a crowd!
Lightly grease 9x13 baking dish. Spread pineapple with juice over the bottom of dish. Add a layer of blueberries and 1/3 cup sugar. Add the box of cake mix and press down with spoon. Drizzle melted butter over cake mix. Sprinkle remaining 1/3 cup of sugar on top of the cake mix. Cook at 350 degrees for 45 minutes. Remove dish from oven, sprinkle pecans on top and return to oven for 15 minutes more.