In a large bowl, cream butter and sugar until light and fluffy. Beat in eggs and chocolate. Combine flour and cinnamon; gradually add to creamed mixture and mix well. Wrap dough in plastic wrap; refrigerate for 1 hour or until easy to handle.
On a lightly floured surface, roll out dough to 1/4-in. thickness. Cut with a floured 2-in. star-shaped cookie cutter. Place 1 in. apart on ungreased baking sheets. Chill and reroll scraps if desired.
Bake at 350° for 9-11 minutes or until edges are firm. Remove to wire racks.
Every editorial product is independently selected, though we may be compensated or receive an affiliate commission if you buy something through our links.