Preheat the oven to 350 F.

Grease or line a 9×5 loaf pan and set aside.

Combine the flour, baking soda, baking powder and salt together in a small mixing bowl and set aside.

In a large mixing bowl whisk together the butter, granulated sugar, eggs, and sour cream. Fold in orange zest.

Slowly stir the dry ingredients into the wet ingredients until the batter is nice and smooth.

Fold in chopped cranberries and walnuts.

Pour batter into the prepared loaf pan.

Bake for 55-60 minutes or until a toothpick inserted in the middle comes out clean. Let the cranberry walnut bread rest in the pan for 10 minutes before removing and placing it on a wire rack.

Cool completely before slicing.