Combine flour, graham crumbs, 3 Tbsp. sugar, baking powder and 1/2 tsp. cinnamon in medium bowl. Cut in butter with pastry blender or 2 knives until mixture resembles coarse crumbs. Add apples, eggs and 2 Tbsp. milk; stir just until blended. (Do not overmix.)
Mix Neufchatel, remaining milk and 1 Tbsp. of the remaining sugar until blended.
Divide dough in half; pat each half into 6-inch round on lightly floured surface. Place 1 dough round on baking sheet sprayed with cooking spray; spread with Neufchatel mixture to within 1/4 inch of edge. Cover with remaining dough round; press edges together to seal. Mix remaining sugar and cinnamon; sprinkle over dough.
Bake 25 to 28 min. or until top is golden brown and toothpick inserted into center of top layer of dough comes out clean. Cool on baking sheet 10 min. Transfer to cutting board. Cut into 12 wedges. Serve warm or at room temperature.