1Heat oven to 350°F. Grease bottom and sides of 9-inch square pan with shortening or cooking spray.
2In small bowl, mix cracker crumbs, butter and sugar thoroughly with fork. Press evenly in bottom of pan. Refrigerate while preparing cream cheese mixture.
3In small bowl, beat cream cheese with electric mixer on medium speed until light and fluffy. Gradually beat in condensed milk until smooth. Beat in lime juice and lime peel. Spread over crust.
4Bake about 35 minutes or until center is set. Cool 30 minutes. Cover loosely; refrigerate at least 3 hours or until chilled. Cut into 6 rows by 6 rows. Garnish with additional lime peel. Store covered in refrigerator.