Preheat oven to 350°. Cream butter and brown sugar until light and fluffy, 5-7 minutes. Beat in eggs and molasses. In another bowl, whisk the next 8 ingredients; gradually beat into creamed mixture., Shape into 1-in. balls; place 2 in. apart on ungreased baking sheets. Bake until tops are cracked, 8-10 minutes. Cool 2 minutes before removing from pans to wire racks to cool completely., For frosting, beat cream cheese until fluffy. Add remaining ingredients; beat until smooth. Frost cookies. Refrigerate in an airtight container.