Preheat oven to 350°F. Roll pastry to 12-inch circle on lightly floured surface. Line 10-inch quiche dish or tart pan with removable bottom with pastry. Trim edge of pastry even with top of dish; pierce pastry with fork. Bake 15 minutes. Set aside.
Beat cream cheese, 1/3 cup sugar and vanilla in large bowl with electric mixer on medium speed until well blended. Add egg; mix well. Blend in sour cream. Pour into crust; top with apples. Mix flour, 1/4 cup sugar and cinnamon; cut in butter with pastry blender or 2 knives until mixture resembles coarse crumbs. Stir in chopped nuts; sprinkle over apples.
Bake 50 minutes or until golden brown. Cool.