Cream sugar and butter. Beat eggs and orange peel. Combine flour, baking powder, salt and flax seed. Beat dry ingredients into butter, alternating with bananas. Stir in cranberries. Turn into well greased 9 x 5 loaf pan. Top with chopped walnuts.
Bake at 350 degrees for 60 -70 minutes.
Cool 10 minutes and turn onto wire rack. Cool.
If desired - drizzle with powder sugar icing: 1 cup powder sugar, Tbsp melted butter, 2 Tbsp water.