Preheat the oven to 350°F. Spritz a 13 9-inch baking pan with cooking spray. Set aside.
In a large bowl use an electric mixer to beat together the cake mix, 1/2 cup melted butter and 1 large egg until fully moistened. Press onto the bottom of the baking dish.
In the same mixing bowl,beat together the cream cheese, powdered sugar. remaining 1/2 cup of melted butter and vanilla.
Add 3 large eggs. Continue to beat for 2 minutes until creamy and fluffy.
Mix in the crushed pineapple and flaked coconut by hand. Pour over the cake mix crust.
Bake for 40-45 minutes or until the center still "jiggles" when gently shaken. Cool in pan on a cooling rack to room temperature before cutting into bars.