In a large mixing bowl, combine first four ingredients.
Beat until light and fluffy, scraping the bowl occasionally.
Combine flour, baking powder and salt; add to the creamed mixture.
Refrigerate at least 1 hour.
In a small bowl, combine cranberries, walnuts and orange peel; set aside.
On a lightly floured surface, roll dough into a 10-inch square.
Combine brown sugar and milk; spread over dough.
Sprinkle with the cranberry mixture, leaving about a ½-inch edge at both ends of dough; roll up tightly, jelly-roll style.
Wrap with waxed paper; chill several hours or overnight.
Cut roll into ¼-inch slices and place on well-greased cookie sheets.
Bake at 375° for 14-15 minutes or until edges are light brown.