In small bowl toss together graham cracker crumbs margarine or butter and 2 tablespoons of sugar Reserve 2 tablespoons of crumb mixture for garnish press remaining crumb mixture onto bottom and two and a quarter inches up the sides of a 9 inch springform pan chill in freezer while preparing filling

In large mixing bowl beat cream cheese on medium speed of electric mixer until fluffy add 1 and a third cups sugar,cornstarch and vanilla beat till combined. add eggs 1 at a time beating until just combined after each addition stir in sour cream

Pour into crust bake at 325°F for one and a quarter hours or until center is almost set cool on wire rack for 15 minutes loosen sides of pan continue cooling on wire rack for 45 minutes more

Sprinkle top with reserved crumbs and garnish as needed refrigerate at least 3 hours store in refrigerator