Heat oven to 350°F. Grease bottom and sides of 9-inch square pan with shortening. In large bowl, beat 1/2 cup butter and granulated sugar with electric mixer on medium speed until light and fluffy. Beat in vanilla and eggs until fluffy. Beat in applesauce mixture just until mixed. Stir in flour, baking soda, cinnamon, nutmeg and salt, scraping bowl once, just until blended. Pour into pan.