Yum-Yum Pie

1 graham cracker pie crust
2 c. blueberries
1/2 c. sugar
1 T. cornstarch
1 small carton Cool Whip
8 oz. cream cheese

  Mix blueberries, sugar and cornstarch;  cook until thickened.    Cool.  Soften cream cheese and mix with Cool Whip.  In crust layer cream cheese mixture, blueberries and cream cheese mixture.  Garnish with graham cracker crumbs.  Cool