1Heat oven to 375°F. In large bowl, stir all ingredients except 1/2 cup chips and the shortening until dough forms. Drop dough by rounded teaspoonfuls 2 inches apart onto ungreased cookie sheet.
2Bake 9 to 11 minutes or until edges are golden brown. Cool 1 minute; remove from cookie sheet to wire rack. Cool completely, about 30 minutes.
3In small microwavable bowl, melt 1/2 cup chips and the shortening on High 30 to 60 seconds, stirring every 15 seconds, until melted. Drizzle over cookies.