Blind bake a pie shell -- you can make your own dough or Pillsbury
makes a decent one.
For the cream cheese filling: with a hand mixer or whisk, blend
the cream cheese, sugar, vanilla, and heavy cream until light and
smooth.
For the the blueberry filling: Put the sugar, cornstarch, and salt in
a medium pan. Add the water and 2 cups of the blueberries. Cook
over medium heat, stirring constantly. The mixture will seize up and
thicken after 4 or 5 minutes. Take off the heat and stir in the
lemon juice and butter. Pour the remaining blueberries in and stir
until coated.
Spread the cream cheese mixture over the bottom of the cooled pie
crust. Drop the blueberry mixture over the cream cheese in large
spoonfulls, then gently spread them around, trying tno to msuh the
cream cheese layer. There should be two distinct layers. Chill in
the refrigerator for 30 minutes or until set. Let it come to room
temperature before serving.