HEAT oven to 350°F.
TOSS spaghetti with half the Parmesan and egg; press onto bottom and up side of 9-inch pie plate to form crust.
MIX meat and spaghetti sauce; spread onto crust. Top with mozzarella and remaining Parmesan.
BAKE 30 min. or until heated through. Let stand 5 min. before cutting to serve.