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Heat oven to 350ºF. Spray bottom and sides of 8-inch square pan with cooking spray. In large bowl, place cookie mix and pecans. Cut in butter, using pastry blender or fork, until mixture looks like coarse crumbs. With fork, stir in egg. Press half of cookie mixture in bottom of pan. Bake 15 to 18 minutes or until golden brown. Reserve remaining cookie mixture.