HEAT oven to 425ºF.
BEAT butter and 1/3 cup sugar in small bowl with mixer until light and fluffy. Add flour; mix well. Press onto bottom and 1 inch up side of 9-inch springform pan.
BEAT cream cheese and 1/3 cup of the remaining sugar in same bowl with mixer until well blended. Add egg and vanilla; mix well. Spread onto bottom of crust. Mix remaining sugar and cinnamon. Add to pears in large bowl; toss to coat. Arrange over cream cheese layer; top with nuts.
BAKE 10 min. Reduce temperature to 375°F. Bake 25 to 30 min. or until centre is set. Cool completely. Run knife around rim of pan to loosen torte. Remove rim. Refrigerate torte 3 hours.