PREHEAT oven to 350º F.
BEAT butter and sugar in large mixer bowl until creamy. Beat in vanilla extract. Gradually beat in flour, nuts and cinnamon. Stir in 1 ½ cups morsels. Roll dough into 1-inch balls; place on ungreased baking sheets.
BAKE for 10 to 12 minutes or until set and light golden brown on bottom. Cool on baking sheets for 2 minutes; remove to wire racks to cool completely.
MICROWAVE remaining morsels in heavy-duty plastic bag on HIGH (100%) power for 30 seconds; knead. Microwave at 10- to 15-second intervals, kneading until smooth. Cut a tiny corner from bag; squeeze to drizzle over cookies. Refrigerate cookies for about 5 minutes or until chocolate is set. Store at room temperature in airtight container.