Beat butter, granulated sugar, brown sugar and vanilla in large bowl until well blended. Add flour to butter mixture; blend until smooth. Stir in small chocolate chips. Mold scant tablespoon dough around each chocolate piece, covering completely.
Place 1/4 cup HERSHEY'S Mini Chips Semi-Sweet Chocolate and 1 teaspoon shortening in small microwave-safe bowl. Microwave at MEDIUM (50%) 30 seconds; stir. If necessary, microwave at MEDIUM an additional 10 seconds at a time, stirring after each heating, until chocolate is melted and mixture is smooth when stirred.