Line an 8-in. square dish with plastic wrap; set aside. In a microwave-safe bowl, combine the caramels, milk chocolate chips and cream. Microwave, uncovered, on high for 1 minute; stir. Microwave 1 minute longer, stirring every 15 seconds or until caramels are melted and mixture is smooth. Spread into prepared dish; refrigerate for 1 hour or until firm., Using plastic wrap, lift candy out of pan. Cut into 30 pieces; roll each piece into a 1-in. ball. Cover and refrigerate for 1 hour or until firm., In a microwave-safe bowl, melt semi-sweet chips and shortening; stir until smooth. Dip caramels in chocolate; allow excess to drip off. Place on waxed paper; let stand until set. If desired, use additional melted chocolate to drizzle over truffles. Refrigerate until firm.