Beat cream cheese with electric mixer until fluffy.
Add 1 cup sugar and beat until mixture is smooth.
Stir in pecans and spoon into pre-made graham cracker crust.
Bake in a 325° oven for 20 minutes, remove from oven to wire rack and increase oven temperature to 350°.
Blend sour cream, 2 tbsp sugar and vanilla in small bowl.
Spread mixture evenly over baked filling.
Return to over and bake for 10 minutes.
Garnish with pecan halves and/or graham cracker crumbs.
Chill until firm before serving.