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PREHEAT oven to 350°F. Toss spaghetti with half of the Parmesan cheese and egg. Place in 9-inch pie plate; press onto bottom and up side to form crust.
MIX meat and spaghetti sauce; spoon into spaghetti crust. Sprinkle with mozzarella cheese and remaining Parmesan cheese.
BAKE 30 minutes or until heated through. Let stand 5 minutes before cutting into wedges to serve.