Grease an 1.5 L loaf pan. Preheat oven to 350° F (180° C).
Combine flour, cranberries, sugar, walnuts, baking powder and salt. In another bowl, beat egg, orange peel, orange juice, and Hellmann's® Real Mayonnaise until smooth. Stir into flour mixture just until moistened (batter will be stiff). Spoon into pan.
Bake in preheated oven 60 to 70 mins. Loaf is done when toothpick inserted in centre comes out clean. Cool on rack 10 mins.