HEAT oven to 375ºF.
PREPARE crust in 9-inch pie plate as directed on package for one-crust filled pie. Beat cream cheese and 1/4 cup granulated sugar with mixer until blended. Add egg and vanilla; mix well. Spread onto bottom of crust.
MIX remaining granulated sugar, 2 Tbsp. flour and cinnamon. Add to apples in large bowl; toss to evenly coat. Spoon over cream cheese layer. Mix remaining flour, brown sugar and oats in medium bowl. Cut in butter with pastry blender or 2 knives until mixture resembles coarse crumbs; sprinkle over apple mixture. Cover.
BAKE in bottom third of oven 50 min. or until apples are tender, uncovering after 20 min.
serving size = 1 piece (124 g)