Line 10-inch pie plate with pie crust. Carefully spread cream cheese into 6-inch circle on center of crust.
Toss plums with granulated sugar and flour; place over cream cheese. Gently fold edge of crust about 2 inches over plums, leaving center uncovered; sprinkle with cinnamon sugar.
Bake 25 min. or until crust is golden brown and fruit juices are hot and bubbly. Cool slightly before removing tart from pie plate.