Cranberry Bliss Bars -- a la Starbucks

For Cake Base:

margarine (or butter if you want to indulge) - softened

and 1/4 cups brown sugar - packed

large eggs

ground ginger

vanilla

salt

and 1/2 cups all-purpose flour

minced dried cranberries

Lindt or Perugina or other quality white chocolate - coarsely chopped

minced candied ginger

For Frosting:

cream cheese - softened

and 1/2 cups powdered sugar

butter - softened

vanilla

For Garnish:

minced dried cranberries

white chocolate chips (e.g. Ghiradelli or Guittard) -- melted