Preheat oven to 350 degrees and spray either pie dish or 9 inch square Pyrex baking dish with non-stick cooking spray.
Cut crusts off of bread, discard, and then cut bread into bite-size cubes and put on the side.
In a large bowl, combine the butter, sugar, cinnamon and vanilla, and mix well with a wooden spoon.
Beat in the eggs and egg whites, mix well, and then add in the pineapple and two tablespoons of the reserved juice.
Lastly, fold in the bread, mix once again, and then spoon into the baking dish.
Sprinkle cinnamon on top and bake for one hour.
Serve warm or cold and refrigerate leftovers