Dissolve the gelatin in the boiling water. Set aside to cool for about 15 minutes. Then place it in the refrigerator for 30-60 minutes to let it cool to the consistency of egg whites. (A thicker consistency helps keep all the fruit from sinking to the bottom of the gelatin.)
Add the pineapple and pie filling to the gelatin, stirring until well combined. Then, place the gelatin mixture into a 9 1/2 x 13-inch dish or pie pan. Chill in the refrigerator for 2 hours or until set.
Topping
In a mixing bowl, beat the cream cheese, vanilla, sugar, and sour cream until smooth. Spread the mixture evenly over the congealed gelatin.
Chill for 1-2 hours. If using pecans, sprinkle them over the dessert just before serving.
Notes
Speed Chilling
You can speed up the cooling time for this dessert by chilling it in the freezer for 1 hour to set the gelatin layer.
Substitution
Substitute 1 can of blueberries in light syrup (drained) for the can of crushed pineapple in this dessert.