Beat butter and sugars at medium speed with an electric mixer until creamy. Add egg, orange rind and extract, beating until blended. Combine flour, baking soda and salt; gradually add to sugar mixture, beating until just blended. Stir in chocolate chips. Drop by rounded tablespoonfuls onto ungreased (or Silpat-lined) baking sheets. Bake at 350 degrees for 10 to 12 minutes or until edges of cookies are lightly browned. Cool on baking sheets for two minutes, then remove to wire racks to cool completely.