Preheat oven to 350°F. Beat butter and sugar in large bowl with electric mixer on medium speed until light and fluffy. Beat in egg and 1 1/2 teaspoons of the orange extract. Gradually beat in flour and salt until well mixed. Drop dough by rounded teaspoons onto ungreased baking sheets; flatten with fork.
Bake 12 to 14 minutes or until lightly browned. Cool on baking sheets 1 minute. Remove to wire racks; cool completely.
Melt chocolate and shortening in microwavable bowl on HIGH 1 1/2 minutes, stirring after 30 seconds. Add remaining 1 teaspoon extract; stir until chocolate is completely melted.
Dip each cookie halfway into chocolate mixture. Let stand at room temperature or refrigerate on wax paper-lined tray 15 minutes or until chocolate is set..