Heat oven to 425°.
Spread mincemeat in pastry-lined pie pan.
Cover edge with 2- to 3-inch strip of aluminum foil to prevent excessive browning.
Bake 20 minutes.
In small mixer bowl, beat cream cheese, sugar and egg until smooth.
Remove pie from oven; remove foil.
Spread cream cheese mixture over mincemeat.
Reduce oven temperature to 350°.
Bake 20 to 25 minutes longer or until knife inserted in center of topping comes out clean.